How Olympic athletes can try to avoid the norovirus outbreak

A total number of 128 Winter Olympic officials in PyeongChang, South Korea had confirmed cases of norovirus as of Thursday night.

Just a day before the opening ceremony of the 2018 Olympic Winter Games, a norovirus outbreak — at least among the staff members at the Games so far — is threatening to disrupt the sporting event. The virus is a highly contagious stomach illness that induces severe vomiting, nausea and diarrhea, which typically leads to dehydration.

"Symptoms can last anywhere from one to three days," Dr. Sarah Hochman, associate hospital epidemiologist at NYU Langone Health told the Daily News. "It's not fun to be ill from it, and people can still feel weak for days after symptoms subside. The big issue is becoming dehydrated since you're not able to take in enough fluids, which is dangerous for everyone, including an Olympian expected to perform at the top physical level."

There have been reports this week that the Games' are responding by providing a plethora of hand sanitizers available for everyone at all the Olympic venues and arenas, but norovirus is impervious to the usual effects of the cleaner.

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Pyeongchang Winter Olympics opening ceremony
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Pyeongchang Winter Olympics opening ceremony
Pyeongchang 2018 Winter Olympics ? Opening ceremony ? Pyeongchang Olympic Stadium - Pyeongchang, South Korea ? February 9, 2018 - North Korea's supporters cheer before the start the opening ceremony. REUTERS/Kai Pfaffenbach
Pyeongchang 2018 Winter Olympics ? Opening ceremony ? Pyeongchang Olympic Stadium - Pyeongchang, South Korea ? February 9, 2018 - People practice their part in the opening ceremony. REUTERS/Kai Pfaffenbach
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Korean performers demonstrate martial arts during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Matthias Hangst/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Fireworks explode during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Jamie Squire/Getty Images)
Fireworks explode outside the stadium during the opening ceremony of the Pyeongchang 2018 Winter Olympic Games at the Pyeongchang Stadium on February 9, 2018. / AFP PHOTO / JUNG Yeon-Je (Photo credit should read JUNG YEON-JE/AFP/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: White Tiger & Five Kids perform during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Jamie Squire/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Performers entertain the fans during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Matthias Hangst/Bongarts/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Fireworks explode during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Ronald Martinez/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Dancers perform 'The Land of Peace' segment during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Ronald Martinez/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Performers entertain the fans during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Maddie Meyer/Getty Images)
Actors perform during the opening ceremony of the Pyeongchang 2018 Winter Olympic Games at the Pyeongchang Stadium on February 9, 2018. / AFP PHOTO / Kirill KUDRYAVTSEV (Photo credit should read KIRILL KUDRYAVTSEV/AFP/Getty Images)
Participants perform during the opening ceremony of the Pyeongchang 2018 Winter Olympic Games at the Pyeongchang Stadium on February 9, 2018. / AFP PHOTO / Jonathan NACKSTRAND (Photo credit should read JONATHAN NACKSTRAND/AFP/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Fireworks are seen during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Robert Cianflone/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: President Moon Jai-in of South Korea and IOC President Thomas Bach wave during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Maddie Meyer/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Performers entertain the fans during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Maddie Meyer/Getty Images)
Pyeongchang 2018 Winter Olympics ? Opening ceremony ? Pyeongchang Olympic Stadium - Pyeongchang, South Korea ? February 9, 2018 - Performers take part in the opening ceremony. REUTERS/Stefano Rellandini
Pyeongchang 2018 Winter Olympics ? Opening Ceremony ? Pyeongchang Olympic Stadium- Pyeongchang, South Korea ? February 9, 2018 - General view of performers before the opening ceremony. REUTERS/Phil Noble
Pyeongchang 2018 Winter Olympics ? Opening ceremony ? Pyeongchang Olympic Stadium- Pyeongchang, South Korea ? February 9, 2018 - Cheerleaders of North Korea await the start of the opening ceremony. REUTERS/Jorge Silva
Pyeongchang 2018 Winter Olympics ? Opening ceremony ? Pyeongchang Olympic Stadium - Pyeongchang, South Korea ? February 9, 2018 - Martial artists perform before the start the opening ceremony. REUTERS/Kai Pfaffenbach
Pyeongchang 2018 Winter Olympics ? Opening ceremony ? Pyeongchang Olympic Stadium - Pyeongchang, South Korea ? February 9, 2018 - Cheerleaders of North Korea await the start of the opening ceremony. REUTERS/Kim Kyung-Hoon
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Korean performers demonstrate martial arts during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Matthias Hangst/Getty Images)
Members of the North Korean cheering band wave flags ahead of the opening ceremony of the Pyeongchang 2018 Winter Olympic Games at the Pyeongchang Stadium on February 9, 2018. / AFP PHOTO / POOL AND AFP PHOTO / FRANCK FIFE (Photo credit should read FRANCK FIFE/AFP/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Dancers perform during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Sean M. Haffey/Getty Images)
Pyeongchang 2018 Winter Olympics ? Opening ceremony ? Pyeongchang Olympic Stadium - Pyeongchang, South Korea ? February 9, 2018 - Performers take part in the opening ceremony. REUTERS/Damir Sagolj
Pyeongchang 2018 Winter Olympics ? Opening ceremony ? Pyeongchang Olympic Stadium- Pyeongchang, South Korea ? February 9, 2018 - Opening ceremony. REUTERS/Eric Gaillard
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: The South Korean flag 'Taegeukgi' is seen during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Sean M. Haffey/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Dancers perform 'The Land of Peace' segment during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Jamie Squire/Getty Images)
Actors perform during the opening ceremony of the Pyeongchang 2018 Winter Olympic Games at the Pyeongchang Stadium on February 9, 2018. / AFP PHOTO / Mark RALSTON (Photo credit should read MARK RALSTON/AFP/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Entertainers perform during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Dan Istitene/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Beau-James Wells of New Zealand during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Dean Mouhtaropoulos/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: The South Korean flag is carried during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Harry How/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Eric Frenzel of Germany leads the team during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Ronald Martinez/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Samer Tawk of Lebanon leads the team during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Ronald Martinez/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: The athletes from Denmark led by Flag bearer Elena Moller Rigas of Denmark walk out during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Quinn Rooney/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Beau-James Wells of New Zealand and teammates enter the stadium during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Matthias Hangst/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Dancers perform during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Harry How/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: The athletes from Denmark led by Flag bearer Elena Moller Rigas of Denmark walk out during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Quinn Rooney/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Ngozi Onwumere of Nigeria and teammates enter the stadium during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Matthias Hangst/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Akwasi Frimpong of Ghana and teammates enter the stadium during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Matthias Hangst/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Marius Ungureanu of Romania leads the team during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Ronald Martinez/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Mattheiu Osch of Luxembourg leads the team during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Ronald Martinez/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Daumants Dreiskens of Latvia and teammates enter the stadium during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Dean Mouhtaropoulos/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Sophia Ralli of Greece leads her team during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Harry How/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Mattheiu Osch of Luxembourg and teammates enter the stadium during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Dean Mouhtaropoulos/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Tomas Kaukenas of Lithuania and teammates enter the stadium during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Dean Mouhtaropoulos/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer German Madrazo of Mexico and teammates enter the stadium during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Dean Mouhtaropoulos/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Daumants Dreiskens of Latvia leads the team during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Ronald Martinez/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Julian Yee of Malaysia leads the team during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Ronald Martinez/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Ngozi Onwumere of Nigeria leads the team during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Harry How/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Erin Hamlin of the United States and teammates enter the stadium during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Matthias Hangst/Getty Images)
Liechtensteins flagbearer Marco Pfiffner leads the delegation as they parade during the opening ceremony of the Pyeongchang 2018 Winter Olympic Games at the Pyeongchang Stadium on February 9, 2018. / AFP PHOTO / Roberto SCHMIDT (Photo credit should read ROBERTO SCHMIDT/AFP/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Jan Smeekens of the Netherlands and teammates enter the stadium during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Matthias Hangst/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Akwasi Frimpong of Ghana and teammates enter the stadium during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Matthias Hangst/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Connor Wilson of South Africa and teammates enter the stadium during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Matthias Hangst/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Mialitiana Clerc of Madagascar and teammates enter the stadium during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Matthias Hangst/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Jan Smeekens of the Netherlands leads out his country during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Sean M. Haffey/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Emil Hegle Svendsen of Norway leads out his country during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Sean M. Haffey/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Samir Azzimani of Morocco and teammates enter the stadium during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Matthias Hangst/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer of Sweden Niklas Edin and teammates enter the stadium during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Matthias Hangst/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Nevena Ignjatovic of Serbia leads the team during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Ronald Martinez/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Edson Bindilatti of Brazil leads the team during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Ronald Martinez/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Lucas Eguibar of Spain leads out his country during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Sean M. Haffey/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer of Sweden Niklas Edin and teammates enter the stadium during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Dean Mouhtaropoulos/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Dario Cologna of Switzerland and teammates enter the stadium during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Matthias Hangst/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Alessandro Mariotti of San Marino and teammates enter the stadium during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Matthias Hangst/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Yohan Goncalves Goutt of Democratic Republic of Timor-Leste leads the team in the Parade of Athletes during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Quinn Rooney/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Seppe Smits of Belgium and teammates enter the stadium during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Dean Mouhtaropoulos/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Radoslav Yankov of Bulgaria and teammates enter the stadium during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Matthias Hangst/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Alla Tsuper of Belarus and teammates enter the stadium during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Matthias Hangst/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Sophia Ralli of Greece leads the team during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Quinn Rooney/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Veronika Velez-Zuzulova of Slovakia leads the team during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Ronald Martinez/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Samer Tawk of Lebanon leads out his country during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Sean M. Haffey/Getty Images)
PYEONGCHANG, SOUTH KOREA FEBRUARY 9, 2018: Alpine skier Jelena Vujicic of Montenegro carries the national flag during the Parade of Nations at the opening ceremony of the PyeongChang 2018 Winter Olympic Games at Pyeongchang Olympic Stadium. Valery Sharifulin/TASS (Photo by Valery Sharifulin\TASS via Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Vesna Fabjan of Slovenia and teammates enter the stadium during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Dean Mouhtaropoulos/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Marius Ungureanu of Romania leads the team during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Quinn Rooney/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Mattheiu Osch of Luxembourg leads his country during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Harry How/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearers Tessa Virtue and Scott Moir of Canada and teammates enter the stadium during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Dean Mouhtaropoulos/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Shiva Keshavan of India during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Ronald Martinez/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Pita Taufatofua of Tonga and teammates enter the stadium during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Matthias Hangst/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Cheyenne Goh of Singapore and teammates enter the stadium during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Matthias Hangst/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Sebastiano Gastaldi of Argentina and teammates enter the stadium during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Matthias Hangst/Getty Images)
PYEONGCHANG, SOUTH KOREA FEBRUARY 9, 2018: Freestyle Alla Tsuper of Belarus carries the national flag during the Parade of Nations at the opening ceremony of the PyeongChang 2018 Winter Olympic Games at Pyeongchang Olympic Stadium. Valery Sharifulin/TASS (Photo by Valery Sharifulin\TASS via Getty Images)
Monacos flagbearer Rudy Rinaldi delegation parades during the opening ceremony of the Pyeongchang 2018 Winter Olympic Games at the Pyeongchang Stadium on February 9, 2018. / AFP PHOTO / Odd ANDERSEN (Photo credit should read ODD ANDERSEN/AFP/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Albin Tahiri of Kosovo leads the team during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Ronald Martinez/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Marco Pfiffner of Liechtenstein leads the team during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Harry How/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Henrik von Appen of Chile leads the team during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Ronald Martinez/Getty Images)
PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09: Flag bearer Achbadrakh Batmunkh of Mongolia leads the team during the Opening Ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea. (Photo by Harry How/Getty Images)
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"Purell is not effective," Hochman told The News. "Wash your hands frequently with soap and water — it's the most effective way to stay healthy, and bleach-based cleaners are most effective for surfaces. Also make sure your food is cooked through and hot, which is important for any foodborne infection.

Norovirus is shed from stool, Hochman said. It's a fecal-oral disease, meaning a person becomes sick after bacteria found in the stool are swallowed. Few of the virus' hearty particles are needed to cause an infection as it spreads very easily — often because someone, somewhere, didn't wash his or her hands. And the athletes and staff at the Olympics are currently living in the perfect environment for the virus to flourish.

"At the Olympics, everyone is basically dorming together, sharing the same bathroom and common dining areas," Hochman said. "If they're near anyone vomiting, they should wash their hands and try to stay away."

But if an Olympian does contract the virus, he or she shouldn't automatically assume that gold medal dreams will be flushed down the toilet along with any illness-related vomit.

"It they're feeling up to it, they should go ahead and compete," Hochman said. "They may still feel weak from the dehydration but they should be okay. It won't lead to further complications."

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