How long could I be contagious before a positive virus test?
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.
CDC changes, then retracts, web posting on how virus spreads
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.
Analysis: Ventilation should be part of the conversation on school reopening. Why isn’t it?
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?…
In a change, WHO says indoor airborne spread of coronavirus is possible
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.
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.
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.
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…
People who are infected with the coronavirus but don't show any symptoms are playing a major role in spreading the virus.
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.
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