A parasitic infection called Crypto is on the rise in U.S. swimming pools

Be careful when you go for a swim in the neighborhood pool this summer.

The parasitic infection Cryptosporidium — known as Crypto — is on the rise in the US, according to the Centers for Disease Control and Prevention (CDC). The parasite is the most common cause of diarrhea linked to swimming pools and water parks, and it spreads when people swallow something that has come into contact with the feces of a sick person (such as pool water).

The CDC says the infection can make "healthy people sick for up to three weeks with watery diarrhea, stomach cramps, nausea, or vomiting, and can lead to dehydration."

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10. Germany

City center of Munich, Germany

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9. Nigeria

As seen from a plane, the aerial view of Lagos, Nigeria looks like a patchwork quilt of colored roofs, sand, grass and streets.

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8. Bangladesh

The sun is setting over the smoggy city Dhaka

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7. Pakistan

Lahore is the capital of the Pakistani province of Punjab and the second largest city in Pakistan after Karachi with a population of some 7 million people.

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6. Indonesia

Panorama of Jakarta Skyline with blue sky and no traffic. BNI46 Building from left to right

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5. Brazil

A view from Santa Teresa in the hills of Rio de Janeiro as The iconic Cristo Redentor, Christ the Redeemer statue appears out of the clouds while lit up at night time atop the mountain Corcovado. In the foreground is the Favela Morro da Coroa. 

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4. Russia

Morning over the Moscow Kremlin in the sun

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3. United States of America

Crowd of Times Square in a rainy night, New York, USA

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2. India

Local indian people shoping at street market, Mumbai, India.

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1. China

Crowd of people along The Bund in Shanghai

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In 2016, there were at least 32 outbreaks in the country, double the number from 2014. In 2016, Ohio identified 1,940 people with Crypto after observing only 571 cases annually between 2012 and 2015.

The Crypto parasite is hard to kill, since it can survive the standard levels of chlorine and other pool disinfectants that kill most other germs within a few minutes. To get rid of Crypto, the CDC recommends closing pools after contamination for an hours-long period of "hyperchlorination."

Keeping Crypto out of a pool also means relying on people to be responsible about showering before getting in a pool and staying away from the water if they've recently suffered from diarrhea. But that doesn't always happen — a recent survey by the Water Quality and Health Council found that 25% of adults said they'd swim within an hour of having diarrhea and just over half never shower before getting in the pool.

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After realizing that the parasite was on rise, the CDC launched a DNA-fingerprinting tracking system for identifying Crypto outbreaks in 2010.

To avoid getting sick, the CDC recommends not swallowing any water while you swim, which is easier said than done, of course. It just takes a mouthful of water that's been contaminated to make you sick. Experts also urge people to rinse off before diving in, and to take kids on frequent bathroom breaks. They also suggest changing diapers for young ones in a separate area away from the pool.

And if you've been sick with Crypto? Stay out of the water, please.

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