If you are high-risk, the answer is straightforward. If you are low-risk, there is less consensus.
They can result in false negatives, but they remain a valuable tool in stopping the spread of Covid-19. Here’s how to use them most effectively.
In advance of a scientific meeting on Thursday, officials proposed offering new shots to Americans each fall, a strategy long employed against the flu.
Los expertos dicen que tomar este antiviral ayuda a evitar algunos síntomas persistentes de covid y la hospitalización. Pero los malentendidos impiden que más personas tomen el fármaco.
A young version of the coronavirus makes up one-quarter of Covid cases across the United States and over 70 percent of new cases in the Northeast.
R.S.V. has probably peaked, but flu is still surging and Covid-19 cases are rising. Scientists are hopeful next winter will be better.
Nearly all Americans over 65 got their initial Covid vaccines. But that immunity is waning, and this time, the government is offering far less support for new shots.
The research was conducted in part when older variants of the coronavirus were spreading. Other factors may have influenced the conclusions.
With newer Omicron subvariants becoming dominant in the U.S., experts offered advice on reinfection risks.
The new subvariants do not have radically different symptoms from previous versions of Omicron in vaccinated people.