How Viral Infections Cause Long-Term Health Problems In a few patients, the immune system becomes misdirected, attacking the body instead of the virus.
Feeling Terrible After Your Covid Shot? Then It’s Probably Working. Fever, chills and fatigue may all be signs of vigorous antibody production, a new study finds.
Covid Booster and Omicron: Who Should Get a Shot Now? If you are high-risk, the answer is straightforward. If you are low-risk, there is less consensus.
Health Experts Warily Eye XBB.1.5, the Latest Omicron Subvariant 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.
Will Covid Boosters Prevent Another Wave? Scientists Aren’t So Sure. The shots may help older, pregnant and immunocompromised Americans dodge serious illness or death. But the doses are not likely to prevent infections in any group, recent studies suggest.