COVID-19 test results provide valuable data that public health departments can use to assess needs and modify responses.

Many people with long COVID are falling through the cracks of a system that was difficult to navigate even before the pandemic.

These three respiratory illnesses—and others—share many of the same symptoms.

Biden may not have used the right word when he described the pandemic as “over,” but things are trending in the right direction.

Updated boosters could go to the “worried well” who have good insurance rather than to those at highest risk.

Whether omicron coronavirus variants cause long COVID symptoms as often—and as severe—as previous variants is a matter of heated study.

The engineered protein vaccine was highly effective in a clinical trial but faced a long delay for authorization.

The update aims to help the public better protect themselves and understand their risk.

New studies offer evidence that an unexpected virus plays a role—but it needs a helper.

Antibody levels decrease substantially within three months after a booster, according to new clinical trial data.