Oct 02 How long could I be contagious before a positive virus test? By Associated Press Studies have shown that people may be contagious for about two days before developing COVID-19 symptoms. Experts say right before developing symptoms is when people are likely the most contagious. Continue reading
Sep 22 CDC changes, then retracts, web posting on how virus spreads By Mike Stobbe, Associated Press The top U.S. public health agency stirred confusion by posting — and then taking down — an apparent change in its position on how easily the coronavirus can spread from person to person through the air. Continue reading
Aug 10 Analysis: Ventilation should be part of the conversation on school reopening. Why isn’t it? By Alexandra Feathers, STAT News COVID-19 is mainly transmitted through respiratory droplets in the air. Why isn't improving ventilation a key part of the effort to reopen schools?… Continue reading
Jul 10 In a change, WHO says indoor airborne spread of coronavirus is possible By Associated Press The World Health Organization is acknowledging the possibility that COVID-19 might be spread in the air under certain conditions. This comes after an open letter from more than 200 scientists published this week urging the agency to do so. Continue reading
Jul 09 Aerosols may play a larger role in COVID-19 transmission than previously thought By Byron Erath, Andrea Ferro, Goodarz Ahmadi, The Conversation More than 200 scientists wrote to the WHO, warning about aerosol transmission of the coronavirus. The WHO has since acknowledged the evidence but hasn't change its advice yet. Continue reading
Jun 16 Public bathrooms carry coronavirus risks. Here’s how to be careful By William Petri, The Conversation Public restrooms can be scary when it comes to coronavirus, and they get scarier when you look at how the virus spreads. A doctor explains how to stay safe when you're traveling and really gotta go. Continue reading
May 21 Watch 6:54 A virologist answers viewer questions about coronavirus transmission During this unprecedented crisis, we all have questions -- and the NewsHour is turning to experts for answers. In this edition of Ask Us, virologist Angela Rasmussen of Columbia University joins Amna Nawaz to take viewer questions on transmission of… Continue watching
May 19 5 questions about asymptomatic COVID-19 cases, answered By William Petri, The Conversation People who are infected with the coronavirus but don't show any symptoms are playing a major role in spreading the virus. Continue reading
Jun 03 Watch Vaccination, Education Key to Stemming Asian Hepatitis Outbreaks Spencer Michels reports on the campaigns to fight hepatitis B among Asian populations worldwide. The potentially fatal liver disease is100 times more likely to afflict Asians than non-Asians. Continue watching