What is the Zika virus? Your questions answered

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In-Depth Look Inside the "Explosive" Zika Virus

The World Health Organization meets next week to decide whether to declare Zika a global emergency.

The virus is spreading fast across the Americas, and WHO expects 3-4 million people to be infected over the next year. Scientists are urgently looking into whether the virus causes birth defects. "We know many people are concerned or scared," says Dr. Anne Schuchat of the U.S. Centers for Disease Control and Prevention.

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31 PHOTOS
Zika, health agents trying to eradicate Zika mosquitoes in South America, Central America
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What is the Zika virus? Your questions answered
An Aedes aegypti mosquito is photographed through a microscope at the Fiocruz institute in Recife, Pernambuco state, Brazil, Wednesday, Jan. 27, 2016. The mosquito is a vector for the proliferation of the Zika virus currently spreading throughout Latin America. New figures from Brazil's Health Ministry show that the Zika virus outbreak has not caused as many confirmed cases of a rare brain defect as first feared. (AP Photo/Felipe Dana)
A Sucre municipal worker fumigates for Aedes aegypti mosquitoes that transmit the Zika virus in the Petare neighborhood of Caracas, Venezuela, Monday, Feb. 1, 2016. Venezuela is reporting a jump in cases of a rare, sometimes paralyzing syndrome that may be linked to the Zika virus. (AP Photo/Fernando Llano)
In this Wednesday, Jan. 27, 2016 photo, Aedes aegypti mosquitoes sit in a petri dish at the Fiocruz institute in Recife, Pernambuco state, Brazil. The mosquito is a vector for the proliferation of the Zika virus spreading throughout Latin America. New figures from Brazil's Health Ministry show that the Zika virus outbreak has not caused as many confirmed cases of a rare brain defect as first feared. (AP Photo/Felipe Dana)
RECIFE, BRAZIL - FEBRUARY 01: David Henrique Ferreira, 5 months, who was born with microcephaly, is examined by a doctor on February 1, 2016 in Recife, Pernambuco state, Brazil. Ferreira's mother says she spends up to eight hours per day in transit on buses, three days per week, to visit a litany of doctors with David. In the last four months, authorities have recorded thousands of cases in Brazil in which the mosquito-borne Zika virus may have led to microcephaly in infants. The ailment results in an abnormally small head in newborns and is associated with various disorders including decreased brain development. The World Health Organization (WHO) declared the Zika virus a 'public health emergency of international concern' today. (Photo by Mario Tama/Getty Images)
Health ministry personnel fumigate a classroom against the Aedes aegypti mosquito, vector of the dengue, Chikungunya and Zika viruses in Tegucigalpa, , on February 1, 2016. Honduran President Juan Orlando Hernandez on Friday declared the country on a preventive state of alert due to the Zika virus which in the last 44 days killed a person and infected some 1000. AFP PHOTO/Orlando SIERRA. / AFP / ORLANDO SIERRA (Photo credit should read ORLANDO SIERRA/AFP/Getty Images)
In this Thursday, Jan. 28, 2016 photo, Daniele Ferreira dos Santos holds her son Juan Pedro as he undergoes visual exams at the Altino Ventura foundation in Recife, Pernambuco state, Brazil. Santos was never diagnosed with Zika, but she blames the virus for her sonâs defect and for the terrible toll it has taken on her life. (AP Photo/Felipe Dana)
A man works on a fence amidst a cloud of insecticide as city workers fumigate to combat the Aedes Aegypti mosquitoes that transmits the Zika virus, at the San Judas Community in San Salvador, El Salvador, Tuesday, Jan. 26, 2016. Worries about the rapid spread of Zika through the hemisphere has prompted officials in El Salvador, Colombia and Brazil to suggest women stop getting pregnant until the crisis has passed. (AP Photo/Salvador Melendez)
A health worker stands in the Sambadrome as he sprays insecticide to combat the Aedes aegypti mosquitoes that transmits the Zika virus in Rio de Janeiro, Brazil, Tuesday, Jan. 26, 2016. Inspectors begin to spray insecticide around Sambadrome, the outdoor grounds where thousands of dancers and musicians will parade during the city's Feb. 5-10 Carnival celebrations. Brazil's health minister says the country will mobilize some 220,000 troops to battle the mosquito blamed for spreading a virus linked to birth defects. (AP Photo/Leo Correa)
Carmen Chicas Mejia, 82, covers her mouth and nose while city workers fumigate her home to combat the Aedes Aegypti mosquitoes that transmit the Zika virus, at the San Judas Community in San Salvador, El Salvador, Tuesday, Jan. 26, 2016. Worries about the rapid spread of Zika through the hemisphere has prompted officials in El Salvador, Colombia and Brazil to suggest women stop getting pregnant until the crisis has passed. (AP Photo/Salvador Melendez)
Dead insects and larvae float in an empty vase at a cemetery in Cartagena, Colombia, Tuesday, Jan. 26, 2016. Local health workers emptied vases during a campaign to destroy potential hatcheries of Aedes aegypti mosquitoes that transmits the Zika virus at a the cemetery as part of a prevention campaign that according to the health ministry has already infected more than 16,000 people in Colombia, and could hit more than half a million. (AP Photo/Reinaldo Reyes)
A woman covers her mouth while city workers fumigate insecticide to help combat the Aedes Aegypti mosquitoes that transmit the Zika virus, at the San Judas Community in San Salvador, El Salvador, Tuesday, Jan. 26, 2016. Worries about the rapid spread of Zika through the hemisphere has prompted officials in El Salvador, Colombia and Brazil to suggest women stop getting pregnant until the crisis has passed. (AP Photo/Salvador Melendez)
A health worker stands in the Sambadrome as he sprays insecticide to combat the Aedes aegypti mosquitoes that transmit the Zika virus, in Rio de Janeiro, Brazil, Tuesday, Jan. 26, 2016. Inspectors began to spray insecticide around the Sambadrome, the outdoor grounds where thousands of dancers and musicians will parade during the city's Feb. 5-10 Carnival celebrations. Brazil's health minister says the country will mobilize some 220,000 troops to battle the mosquito blamed for spreading a virus linked to birth defects. (AP Photo/Leo Correa)
Members of the Migente foundation check mosquito traps in the Paris neighborhood, Bello municipality, Antioquia department, Colombia on January 26, 2016. The Study and Control of Tropical Diseases Program (PECET) of Antioquia's University released one year ago Aedes aegypti mosquitos carrying the Wolbachia pipientis bacteria, which prevents them from transmitting the Zika and dengue viruses, as part of project to fight dengue. The Zika virus, a mosquito-borne disease suspected of causing serious birth defects, is expected to spread to all countries in the Americas except Canada and Chile, the World Health Organization said. AFP PHOTO /Raul ARBOLEDA / AFP / -- / RAUL ARBOLEDA (Photo credit should read RAUL ARBOLEDA/AFP/Getty Images)
A photographer walks through the fumes as Health Ministry employee fumigate against the Aedes aegypti mosquito to prevent the spread of the Zika virus in Soyapango, six km east of San Salvador, on January 21, 2016. Health authorities have issued a national alert against the Aedes Aegypti mosquito, because of the link between the Zika virus and microcephaly and Guillain-Barré Syndrome in fetuses. AFP PHOTO/Marvin RECINOS / AFP / Marvin RECINOS (Photo credit should read MARVIN RECINOS/AFP/Getty Images)
Army soldiers check for Aedes aegypti mosquito larvae during a clean-up operation against the insect, which transmits the Zika virus, in Sao Paulo, Brazil on January 22, 2016. AFP PHOTO/Miguel SCHINCARIOL / AFP / Miguel Schincariol (Photo credit should read MIGUEL SCHINCARIOL/AFP/Getty Images)
Army soldiers check for Aedes aegypti mosquito larvae during a clean-up operation against the insect, which transmits the Zika virus, in Sao Paulo, Brazil on January 22, 2016. AFP PHOTO/Miguel SCHINCARIOL / AFP / Miguel Schincariol (Photo credit should read MIGUEL SCHINCARIOL/AFP/Getty Images)
Army soldiers check for Aedes aegypti mosquito larvae during a clean-up operation against the insect, which transmits the Zika virus, in Sao Paulo, Brazil on January 22, 2016. AFP PHOTO/Miguel SCHINCARIOL / AFP / Miguel Schincariol (Photo credit should read MIGUEL SCHINCARIOL/AFP/Getty Images)
A health agent from the Sao Paulo secretariat of public health and army soldiers check for Aedes aegypti mosquito larvae during a clean-up operation against the insect, which transmits the Zika virus, in Sao Paulo, Brazil on January 22, 2016. AFP PHOTO/Miguel SCHINCARIOL / AFP / Miguel Schincariol (Photo credit should read MIGUEL SCHINCARIOL/AFP/Getty Images)
A Health Ministry employee fumigates a home against the Aedes aegypti mosquito to prevent the spread of the Zika virus in Soyapango, six km east of San Salvador, on January 21, 2016. Health authorities have issued a national alert against the Aedes Aegypti mosquito, because of the link between the Zika virus and microcephaly and Guillain-Barré Syndrome in fetuses. AFP PHOTO/Marvin RECINOS / AFP / Marvin RECINOS (Photo credit should read MARVIN RECINOS/AFP/Getty Images)
A Health Ministry employee fumigates a home against the Aedes aegypti mosquito to prevent the spread of the Zika virus in Soyapango, six km east of San Salvador, on January 21, 2016. Health authorities have issued a national alert against the Aedes Aegypti mosquito, because of the link between the Zika virus and microcephaly and Guillain-Barré Syndrome in fetuses. AFP PHOTO/Marvin RECINOS / AFP / Marvin RECINOS (Photo credit should read MARVIN RECINOS/AFP/Getty Images)
TOPSHOT - A Health Ministry employee fumigates a home against the Aedes aegypti mosquito to prevent the spread of the Zika virus in Soyapango, six km east of San Salvador, on January 21, 2016. Health authorities have issued a national alert against the Aedes Aegypti mosquito, because of the link between the Zika virus and microcephaly and Guillain-Barré Syndrome in fetuses. AFP PHOTO/Marvin RECINOS / AFP / Marvin RECINOS (Photo credit should read MARVIN RECINOS/AFP/Getty Images)
Health ministry employees spray to eliminate breeding sites of the Aedes Aegypti mosquito, which transmits diseases such as the dengue, chicunguna and Zica viruses, in a Tegucigalpa cemetery on January 21, 2016. The medical school at the National Autonomous University of Honduras (UNAH) recommended that women in the country avoid getting pregnant for the time being due to the presence of the Zika virus. If a pregnant woman is infected by the virus, the baby could be born with microcephaly. AFP PHOTO/Orlando SIERRA / AFP / ORLANDO SIERRA (Photo credit should read ORLANDO SIERRA/AFP/Getty Images)
A specialist fumigates the Nueva Esperanza graveyard in the outskirts of Lima on January 15, 2016. Health officials fumigated the largest cementery in Peru and second largest in the world to prevent Chikunguya and Zika virus, which affect several South American countries. AFP PHOTO/ERNESTO BENAVIDES / AFP / ERNESTO BENAVIDES (Photo credit should read ERNESTO BENAVIDES/AFP/Getty Images)
View of the Nueva Esperanza graveyard as it is fumigated in the outskirts of Lima on January 15, 2016. Health officials fumigated the largest cemetery in Peru and second largest in the world to prevent Chikunguya and Zika virus, which affect several South American countries. AFP PHOTO/ERNESTO BENAVIDES / AFP / ERNESTO BENAVIDES (Photo credit should read ERNESTO BENAVIDES/AFP/Getty Images)
A pregnant woman is attended at the Maternal and Children's Hospital in Tegucigalpa on January 21, 2016. The medical school at the National Autonomous University of Honduras (UNAH) recommended that women in the country avoid getting pregnant for the time being due to the presence of the Zika virus. If a pregnant woman is infected by the virus, the baby could be born with microcephaly. AFP PHOTO/Orlando SIERRA / AFP / ORLANDO SIERRA (Photo credit should read ORLANDO SIERRA/AFP/Getty Images)
A pregnant woman waits to be attended at the Maternal and Children's Hospital in Tegucigalpa on January 21, 2016. The medical school at the National Autonomous University of Honduras (UNAH) recommended that women in the country avoid getting pregnant for the time being due to the presence of the Zika virus. If a pregnant woman is infected by the virus, the baby could be born with microcephaly. AFP PHOTO/Orlando SIERRA / AFP / ORLANDO SIERRA (Photo credit should read ORLANDO SIERRA/AFP/Getty Images)
Aedes aegypti mosquito larvae sit in a petri dish at the Fiocruz institute in Recife, Pernambuco state, Brazil, Wednesday, Jan. 27, 2016. The mosquito is a vector for the proliferation of the Zika virus currently spreading throughout Latin America. New figures from Brazil's Health Ministry show that the Zika virus outbreak has not caused as many confirmed cases of a rare brain defect as first feared. (AP Photo/Felipe Dana)
A technician of the Fiocruz institue stores Aedes aegypti mosquitoes to be used in research, in Recife, Pernambuco state, Brazil, Wednesday, Jan. 27, 2016. The mosquito is a vector for the proliferation of the Zika virus currently spreading throughout Latin America. New figures from Brazil's Health Ministry show that the Zika virus outbreak has not caused as many confirmed cases of a rare brain defect as first feared. (AP Photo/Felipe Dana)
CORRECTS CDC IS INVESTIGATING WHETHER AEDES ALBOPICTUS SPREADS THE ZIKA VIRUS, NOT DEFINITIVE - This 2003 photo provided by the Centers for Disease Control and Prevention shows a female Aedes albopictus mosquito acquiring a blood meal from a human host. On Friday, Jan. 15, 2016, U.S. health officials are telling pregnant women to avoid travel to Latin America and Caribbean countries with outbreaks of a tropical illness linked to birth defects. The Zika virus is spread through mosquito bites from Aedes aegypti and the CDC is investigating whether it is also spread by Aedes albopictus. The disease causes only a mild illness in most people. But thereâs been mounting evidence linking the virus to a surge of a rare birth defect in Brazil. (James Gathany/Centers for Disease Control and Prevention via AP)
Aedes aegypti mosquitos are seen in containers at a lab of the Institute of Biomedical Sciences of the Sao Paulo University, on January 8, 2016 in Sao Paulo, Brazil. Researchers at the Pasteur Institute in Dakar, Senegal are in Brazil to train local researchers to combat the Zika virus epidemic. / AFP / NELSON ALMEIDA (Photo credit should read NELSON ALMEIDA/AFP/Getty Images)
Aedes aegypti mosquitos are seen in containers at a lab of the Institute of Biomedical Sciences of the Sao Paulo University, on January 8, 2016 in Sao Paulo, Brazil. Researchers at the Pasteur Institute in Dakar, Senegal are in Brazil to train local researchers to combat the Zika virus epidemic. / AFP / NELSON ALMEIDA (Photo credit should read NELSON ALMEIDA/AFP/Getty Images)
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Here are some answers to questions many are asking:

1) How worried should I be?

It depends on where you live. For most U.S. residents, Zika is unlikely to be a problem. That's because it take two factors for the virus to spread: actively infected people and the right kind of mosquitoes to spread it.

"For the average American who is not traveling, this is not a problem," Schuchat told reporters. It's winter now, and mosquitoes are scarce. OnlyAedes aegypti mosquitoes are known for sure to spread Zika, and they're common only in the very southernmost states -- south Florida, south Texas, Louisiana and Hawaii. Even there, they would have to bite someone already infected and then bite others very soon afterward, and with just the occasional traveler showing up with Zika, that is unlikely to happen much.

"You can say that there really is essentially no risk at all [now] because we don't have local Zika transmission in the United States," said Dr. Anthony Fauci, head of the National Institute of Allergy and Infectious Diseases. Dengue, a virus closely related to Zika that is spread by the same mosquitoes, has caused only a very few, very small outbreaks over the past few decades.

And 80 percent of people who get Zika don't even know it. The other 20 percent may get a rash, a fever or pinkeye, but Zika hardly ever causes serious illness.

But pregnant women planning to travel should worry. "For pregnant women who to plan travel: Please take this very seriously," Schuchat said. CDC has advised pregnant women to seriously consider postponing travel to any Zika-affected regions. That's because Zika is suspected of causing microcephaly, a serious birth defect in which the brain is underdeveloped.

2) Where is the Zika virus? When will it get to my state?

The occasional traveler will show up with Zika, but CDC says that's nothing to worry about. New York has five known cases, but it's cold and there are no mosquitoes, so there is no chance of spread. CDC reports 31 cases in travelers in 11 states and Washington, D.C, in the past year, as well as 19 cases in Puerto Rico and a single case in the U.S. Virgin Islands.

Fauci notes that many news outlets are publishing maps that show the known distribution of Aedes aegypti mosquitoes and their cousins, Aedes albopictus. "Don't make the assumption that you are going to see outbreaks in that distribution of mosquitoes," Fauci said. "That's just where the mosquitoes are." Again, those mosquitoes would need a pool of infected humans to bite before they could spread the virus. Right now, Zika is spreading fastest in tropical cities with dense populations and poor mosquito control. "We do think the living conditions in general in the United States -- the lack of density, better air conditioning, wider use of screens -- will keep us in better shape," Fauci said.

Florida has the dual risk of having the right mosquitoes and lots of travel to and from the affected areas. "We consider Florida a prime risk," said Jorge Rey, an entomologist at the University of Florida. "If you look at past histories, chikungunya and dengue have been transmitted in the Keys."

3) I just got bitten by a mosquito. Will I get Zika?

Not unless the mosquito has it. So if it was a mosquito in in a U.S. area where Zika hasn't been seen -- which is all of the United States right now -- the answer is almost certainly "no." If you are in a Zika-affected region, the answer is "maybe." Researchers do not know the "attack rate" -- how many people get infected once Zika's in an area. They also do not know whether a single bite can transmit the virus or how long the mosquito has to have been infected to spread it. And if it's not an Aedes mosquito, also called a yellow fever mosquito, it does not transmit the virus.

4) We're headed to the Caribbean for our honeymoon. Should we worry?

You should definitely take precautions against getting bitten. That means long sleeves and long pants, use of a mosquito repellent such as DEET and staying inside when possible. There's a chemical called permethrin that you can spray on your clothing and gear to repel mosquitoes. And if you were planning on starting a family right away, you might want to rethink that. Women who might be pregnant are advised to avoid affected areas. Doctors know that the earlier in pregnancy a woman gets exposed to a virus or a toxin that can cause brain damage, the worse the effects are on the fetus. Until experts know more about the risks to a pregnancy, they advise taking care.

But a week or two after getting back, if you have not shown symptoms, it's probably safe to get pregnant. The virus doesn't stay in the body for long.

Authorities in El Salvador have taken the extreme step of advising women to not get pregnant at all for two years.

What Are the Symptoms of Zika Virus?

5) I'm pregnant and just got back from Brazil. What can I do?

Try not to worry. CDC says doctors should ask all pregnant women about their travel histories, and if they have symptoms of a possible Zika infection, they should get tested. That would be a rash and a fever. And women who have been to an affected area and whose fetus looks like it may have microcephaly on an ultrasound should also be tested. Then women should continue to get regular ultrasounds to watch for any signs of trouble.

CDC has guidelines here.

For women with no symptoms, it's not clear what they could or should do. No one knows whether a woman without symptoms could pass Zika virus to her baby. "We are working hard to find out. It's possible," Schuchat said. "There are other viral conditions that can do that. That's why we are taking this very seriously. It's difficult for women to hear and one of the reasons we encouraged women who are pregnant to postpone travel to affected areas."

And no one knows how many women who get Zika while pregnant will have a baby with microcephaly, or whether it's even Zika, or Zika alone, that is to blame.

6) My neighbors are from El Salvador. Are they going to spread Zika?

Any traveler who has just returned from a Zika-affected country with an active infection could potentially get bitten by a mosquito and spread Zika that way -- if the right mosquitoes are around. The infection lasts for a few days to a week. It's unlikely anyone could transmit the virus after a week. So if you don't live somewhere with Aedes aegypti mosquitoes, or if your neighbor hasn't just returned with an infection, the answer is "no."

7) Can't they just kill all the mosquitoes?

People have been trying for hundreds of years to do that. Mosquito control can work -- wetlands draining and aggressive control with pesticides. But wide use of the best bug killers, like DDT, stopped when their effects on the environment outweighed the benefits. Brazil actually did eradicate the Aedes aegyptimosquitoes that spread Zika, chikungunya, yellow fever and other diseases in the 1950s, but the mosquitoes gradually returned.

"Controlling this type of mosquito is difficult," Schuchat said. "It is easy to say, 'Get rid of the mosquito.' It is a lot harder to do it."

It's very hard to kill Aedes mosquitoes because they like to breed in unexpected places, such as bottle caps filled with water, trash cans and discarded tires. Brazil is experimenting with genetically engineered mosquitoes that lay dud eggs, but it's an early experiment. It's also trying fish that eat mosquito larvae, but that approach doesn't work for urban breeding sites.

See more about the crisis below:

34 PHOTOS
Zika, Mosquito borne illness causing birth defects in Brazil
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What is the Zika virus? Your questions answered
In this Jan. 29, 2016 photo, Tainara Lourenco, who is five months pregnant, sits inside her house at a slum in Recife, Brazil. Like many of the estimated 400,000 women currently pregnant in Brazil, she canât afford mosquito repellent. The government has pledged to start providing repellent to low-income women and promises to deploy the Armed Forces to help eliminate Aedesâ breeding places. (AP Photo/Felipe Dana)
RECIFE, BRAZIL - JANUARY 29: Dr. Valeria Barros treats a 6-week old baby born with microcephaly at the Lessa de Andrade polyclinic during a physical therapy session on January 29, 2016 in Recife, Pernambuco state, Brazil. Health officials believe as many as 100,000 people have been exposed to the Zika virus in Recife, although most never develop symptoms. In the last four months, authorities have recorded around 4,000 cases in Brazil in which the mosquito-borne Zika virus may have led to microcephaly in infants. The ailment results in an abnormally small head in newborns and is associated with various disorders including decreased brain development. According to the World Health Organization (WHO), the Zika virus outbreak is likely to spread throughout nearly all the Americas. (Photo by Mario Tama/Getty Images)
RECIFE, BRAZIL - JANUARY 31: Alice Vitoria Gomes Bezerra, 3-months-old, who has microcephaly, is held by her mother Nadja Cristina Gomes Bezerra on January 31, 2016 in Recife, Brazil. In the last four months, authorities have recorded close to 4,000 cases in Brazil in which the mosquito-borne Zika virus may have led to microcephaly in infants. The ailment results in an abnormally small head in newborns and is associated with various disorders including decreased brain development. According to the World Health Organization (WHO), the Zika virus outbreak is likely to spread throughout nearly all the Americas. (Photo by Mario Tama/Getty Images)
RECIFE, BRAZIL - JANUARY 29: David Henrique Ferreira, 5 months, who was born with microcephaly, is kissed by his mother Mylene Helena Ferreira on January 29, 2016 in Recife, Pernambuco state, Brazil. In the last four months, authorities have recorded around 4,000 cases in Brazil in which the mosquito-borne Zika virus may have led to microcephaly in infants. The ailment results in an abnormally small head in newborns and is associated with various disorders including decreased brain development. According to the World Health Organization (WHO), the Zika virus outbreak is likely to spread throughout nearly all the Americas. (Photo by Mario Tama/Getty Images)
RECIFE, BRAZIL - JANUARY 29: David Henrique Ferreira, 5 months, who was born with microcephaly, is held by his grandmother Maria Elisabeth as his mother stands at right on January 29, 2016 in Recife, Pernambuco state, Brazil. In the last four months, authorities have recorded around 4,000 cases in Brazil in which the mosquito-borne Zika virus may have led to microcephaly in infants. The ailment results in an abnormally small head in newborns and is associated with various disorders including decreased brain development. According to the World Health Organization (WHO), the Zika virus outbreak is likely to spread throughout nearly all the Americas. (Photo by Mario Tama/Getty Images)
Pregnant woman Angelica Prato, infected by the Zika virus, is attended at the Erasmo Meoz University Hospital in Cucuta, Colombia, on January 25, 2016. Authorities in Brazil, Colombia, Ecuador, El Salvador and Jamaica have advised couples to avoid pregnancy for the time being due to the presence of the Zika virus because if a pregnant woman is infected by the virus, the baby could be born with microcephaly. The Zika virus, a mosquito-borne disease suspected of causing serious birth defects, is expected to spread to all countries in the Americas except Canada and Chile, the World Health Organization said. AFP PHOTO/Schneyder Mendoza / AFP / SCHNEYDER MENDOZA (Photo credit should read SCHNEYDER MENDOZA/AFP/Getty Images)
In this Jan. 29, 2016 photo, Tainara Lourenco smiles as she chats with neighbors from the entrance of home at a slum in Recife, Brazil. Unemployed and five months pregnant, 21-year-old Lourenco lives in a slum at the epicenter of Brazilâs tandem Zika and microcephaly outbreaks, the state of Pernambuco. (AP Photo/Felipe Dana)
RECIFE, BRAZIL - JANUARY 27: Alice Vitoria Gomes Bezerra, 3-months-old, who has microcephaly, is placed in her crib by her father Joao Batista Bezerra on January 27, 2016 in Recife, Brazil. In the last four months, authorities have recorded close to 4,000 cases in Brazil in which the mosquito-borne Zika virus may have led to microcephaly in infants. The ailment results in an abnormally small head in newborns and is associated with various disorders including decreased brain development. According to the World Health Organization (WHO), the Zika virus outbreak is likely to spread throughout nearly all the Americas. At least twelve cases in the United States have now been confirmed by the CDC. (Photo by Mario Tama/Getty Images)
Gleyse Kelly da Silva holds her daughter Maria Giovanna as she sleeps in their house in Recife, Pernambuco state, Brazil, Wednesday, Jan. 27, 2016. Brazilian officials still say they believe there's a sharp increase in cases of microcephaly and strongly suspect the Zika virus, which first appeared in the country last year, is to blame. The concern is strong enough that the U.S. Centers for Disease Control and Prevention this month warned pregnant women to reconsider visits to areas where Zika is present. (AP Photo/Felipe Dana)
Kleisse Marcelina ,24, bathes her son Pietro, 2 month, suffering from microcephalia caught through an Aedes Aegypti mosquito bite, in Salvador, Brazil on January 28 , 2016. AFP PHOTO / Christophe SIMON / AFP / CHRISTOPHE SIMON (Photo credit should read CHRISTOPHE SIMON/AFP/Getty Images)
RECIFE, BRAZIL - JANUARY 26: Grandmother Ivalda Caetano holds Ludmilla Hadassa Dias de Vasconcelos (2 months), who has microcephaly, at Oswald Cruz hospital on January 26, 2016 in Recife, Brazil. In the last four months, authorities have recorded close to 4,000 cases in Brazil in which the mosquito-borne Zika virus may have led to microcephaly in infants. The ailment results in an abnormally small head in newborns and is associated with various disorders including decreased brain development. According to the World Health Organization (WHO), the Zika virus outbreak is likely to spread throughout nearly all the Americas. At least twelve cases in the United States have now been confirmed by the CDC. The Brazilian government announced it will deploy more than 200,000 troops to combat the mosquitos which are spreading the Zika virus. (Photo by Mario Tama/Getty Images)
RECIFE, BRAZIL - JANUARY 27: Dr. Vanessa Van Der Linden, the neuro-pediatrician who first recognized and alerted authorities over the microcephaly crisis in Brazil, measures the head of a 2-month-old baby with microcephaly on January 27, 2016 in Recife, Brazil. The baby's mother was diagnosed with having the Zika virus during her pregnancy. In the last four months, authorities have recorded close to 4,000 cases in Brazil in which the mosquito-borne Zika virus may have led to microcephaly in infants. The ailment results in an abnormally small head in newborns and is associated with various disorders including decreased brain development. According to the World Health Organization (WHO), the Zika virus outbreak is likely to spread throughout nearly all the Americas. At least twelve cases in the United States have now been confirmed by the CDC. (Photo by Mario Tama/Getty Images)
RECIFE, BRAZIL - JANUARY 31: Alice Vitoria Gomes Bezerra, 3-months-old, who has microcephaly, is held by her mother Nadja Cristina Gomes Bezerra on January 31, 2016 in Recife, Brazil. In the last four months, authorities have recorded close to 4,000 cases in Brazil in which the mosquito-borne Zika virus may have led to microcephaly in infants. The ailment results in an abnormally small head in newborns and is associated with various disorders including decreased brain development. According to the World Health Organization (WHO), the Zika virus outbreak is likely to spread throughout nearly all the Americas. (Photo by Mario Tama/Getty Images)
Physical therapist Isana Santana treats Ruan Hentique dos Santos, suffering from microcephalia caught through an Aedes Aegypti mosquito bite, at Obras Socias irma dulce hospital in Salvador, Brazil on January 28 , 2016. AFP PHOTO / Christophe SIMON / AFP / CHRISTOPHE SIMON (Photo credit should read CHRISTOPHE SIMON/AFP/Getty Images)
The parents of Icaro Luis , 2 month, suffering from microcephalia caught through an Aedes Aegypti mosquito bite, Physical therapist Isana Santan at the Obras socias irma dulce hospital in Salvador, Brazil on January 28, 2016. AFP PHOTO / Christophe SIMON / AFP / CHRISTOPHE SIMON (Photo credit should read CHRISTOPHE SIMON/AFP/Getty Images)
Physical therapist Isana Santana treats Ruan Hentique dos Santos, suffering from microcephalia caught through an Aedes Aegypti mosquito bite, at Obras Socias irma dulce hospital in Salvador, Brazil on January 28 , 2016. AFP PHOTO / Christophe SIMON / AFP / CHRISTOPHE SIMON (Photo credit should read CHRISTOPHE SIMON/AFP/Getty Images)
Ana Paula Santos, 34, holds her 45-day-old daughter Flavia Alessandra suffering from microcephalia supposedly caught through an Aedes aegypti mosquito bite, at the Obras Sociais Irma Dulce hospital in Salvador, Brazil on January 27, 2016. AFP PHOTO / Christophe SIMON / AFP / CHRISTOPHE SIMON (Photo credit should read CHRISTOPHE SIMON/AFP/Getty Images)
RECIFE, BRAZIL - JANUARY 25: Estafany Perreira holds her nephew David Henrique Ferreira, 5 months, who has microcephaly, on January 25, 2016 in Recife, Brazil. In the last four months, authorities have recorded close to 4,000 cases in Brazil in which the mosquito-borne Zika virus may have led to microcephaly in infants. Microcephaly results in newborns with abnormally small heads and is associated with various disorders including decreased brain development. According to the World Health Organization (WHO), the Zika virus outbreak is likely to further spread in South, Central and North America. At least twelve cases of Zika in the United States have now been confirmed by the CDC. (Photo by Mario Tama/Getty Images)
RECIFE, BRAZIL - JANUARY 25: Mother Mylene Helena Ferreira cares for her son David Henrique Ferreira, 5 months, who has microcephaly, on January 25, 2016 in Recife, Brazil. In the last four months, authorities have recorded close to 4,000 cases in Brazil in which the mosquito-borne Zika virus may have led to microcephaly in infants. Microcephaly results in newborns with abnormally small heads and is associated with various disorders including decreased brain development. According to the World Health Organization (WHO), the Zika virus outbreak is likely to further spread in South, Central and North America. At least twelve cases of Zika in the United States have now been confirmed by the CDC. (Photo by Mario Tama/Getty Images)
In this Dec. 23, 2015 photo, Solange Ferreira bathes her son Jose Wesley in a bucket at their house in Poco Fundo, Pernambuco state, Brazil. Ferreira says her son enjoys being in the water, she places him in the bucket several times a day to calm him. (AP Photo/Felipe Dana)
In this Dec. 23, 2015 photo, 10-year-old Elison nurses his 2-month-old brother Jose Wesley at their house in Poco Fundo, Pernambuco state, Brazil. Suspicion of the link between microcephaly and the Zika virus arose after officials recorded 17 cases of central nervous system malformations among fetuses and newborns after a Zika outbreak began last year in French Polynesia, according to the European Center for Disease Prevention and Control. (AP Photo/Felipe Dana)
In this Dec. 23, 2015 photo, plastic bags and trash lay on the ground in Santa Cruz do Capibaribe, where many cases of Zika where reported in Pernambuco state, Brazil, Wednesday. The Zika virus, first detected about 40 years ago in Uganda, has long seen as a less-painful cousin to dengue and chikunguya, which are spread by the same Aedes mosquito. (AP Photo/Felipe Dana)
In this Dec. 23, 2015 photo, 10-year-old Elison, left, watches as his mother Solange Ferreira bathes Jose Wesley in a bucket at their house in Poco Fundo, Pernambuco state, Brazil. Ferreira says Jose Wesley enjoys being in the water, she places him in the bucket several times a day to calm him. (AP Photo/Felipe Dana)
In this Dec. 23, 2015 photo, Dejailson Arruda holds his daughter Luiza at their house in Santa Cruz do Capibaribe, Pernambuco state, Brazil. More than 2,700 babies have been born in Brazil with microcephaly this year, up from fewer than 150 in 2014. Brazilâs health officials say theyâre convinced the jump is linked to a sudden outbreak of the Zika virus that infected Pereira, though international experts caution itâs far too early to be sure. (AP Photo/Felipe Dana)
In this Dec. 23, 2015 photo, 10-year-old Elison carries his 2-month-old brother Jose Wesley at their house in Poco Fundo, Pernambuco state, Brazil. More than 2,700 babies have been born in Brazil with microcephaly this year, up from fewer than 150 in 2014. (AP Photo/Felipe Dana)
In this Dec. 23, 2015 photo, Jose Wesley sleeps covered by a mosquito net in Poco Fundo, Pernambuco state, Brazil. Jose Wesleyâs mother Solange Ferreira had never heard of microcephaly before her youngest son was diagnosed a couple of days after his birth. (AP Photo/Felipe Dana)
In this Dec. 23, 2015 photo, 5-year-old Elenilson, left, holds a notebook as he plays next to his 2-month-old brother Jose Wesley at their house in Poco Fundo, Pernambuco state, Brazil. Their mother, Solange Ferreira had never heard of microcephaly before her youngest son was diagnosed a couple of days after his birth. (AP Photo/Felipe Dana)
In this Dec. 22, 2015 photo, Angelica Pereira applies perfume on Luiza as her father Dejailson Arruda holds her at their house in Santa Cruz do Capibaribe, Pernambuco state, Brazil. While thereâs never before been a detected link between the virus and microcephaly, âthere has never been an epidemic of Zika in the proportions that we are looking at now in Brazil,â said Pedro Fernando Vasconcelos, a researcher at Evandro Chagas Institute investigating an association between the virus and the birth defects. (AP Photo/Felipe Dana)
In this Dec. 23, 2015 photo, Dejailson Arruda holds his daughter Luiza at their house in Santa Cruz do Capibaribe, Pernambuco state, Brazil. Luiza was born in October with a rare condition, known as microcephaly. Luiza's mother Angelica Pereira was infected with the Zika virus after a mosquito bite. Brazilian health authorities are convinced that Luiza's condition is related to the Zika virus that infected her mother during pregnancy. (AP Photo/Felipe Dana)
In this Dec. 22, 2015 photo, Angelica Pereira holds Luiza outside their house in Santa Cruz do Capibaribe, Pernambuco state, Brazil. Luiza was born in October with a rare condition, known as microcephaly. The Zika virus, first detected in humans about 40 years ago in Uganda, has long seen as a less-painful cousin to dengue and chikunguya, which are spread by the same Aedes mosquito. Until a few months ago, investigators had no reported evidence it might be related to microcephaly. (AP Photo/Felipe Dana)
In this Dec. 22, 2015 photo, Angelica Pereira, right, holds her daughter Luiza as she waits for their appointment with a neurologist at the Mestre Vitalino Hospital in Caruaru, Pernambuco state, Brazil. In November, Brazilian researchers detected the Zika virus genome in amniotic fluid samples from two women whose fetuses were been diagnosed with microcephaly by ultrasound exams, the Pan American Health Organization reported. (AP Photo/Felipe Dana)
In this Dec. 22, 2015 photo, Luiza has her head measured by a neurologist at the Mestre Vitalino Hospital in Caruaru, Pernambuco state, Brazil. Luiza was born in October with a head that was just 11.4 inches (29 centimeters) in diameter, more than an inch (3 centimeters) below the range defined as healthy by doctors. Her rare condition, known as microcephaly, often results in mental retardation. (AP Photo/Felipe Dana)
In this Dec. 22, 2015 photo, Angelica Pereira holds her daughter Luiza as she waits for her husband at their house in Santa Cruz do Capibaribe, Pernambuco state, Brazil. In the early weeks of Angelica Pereiraâs pregnancy, a mosquito bite began bothering her. At first it seemed a small thing. But the next day she awoke with a rash all over her body, a headache, a fever and a burning in her eyes. The symptoms disappeared within four days, but she fears the virus has left lasting consequences. (AP Photo/Felipe Dana)
In this Dec. 22, 2015 photo, Dejailson Arruda holds his daughter Luiza at their house in Santa Cruz do Capibaribe, Pernambuco state, Brazil. Luiza was born in October with a head that was just 11.4 inches (29 centimeters) in diameter, more than an inch (3 centimeters) below the range defined as healthy by doctors. Her rare condition, known as microcephaly, often results in mental retardation. (AP Photo/Felipe Dana)
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