A long-awaited report from Brazil’s Senate concludes that Jair Bolsonaro purposely let the coronavirus kill Brazilians in a failed bid for herd immunity.

The F.D.A. may authorize booster shots of vaccines different from the ones that Americans originally received. The science behind the move is promising.

The finding upends conventional wisdom regarding coughing, long thought to be the main route of transmission.

The C.D.C. looked at children hospitalized with Covid-19 or other illnesses, and found those who were immunized to be far more protected.

The overuse of lights and sirens, combined with speeding, pose heightened risks to emergency responders and civilians. One expert called it a “public health dilemma.”

The agency may act this week, when it is expected to authorize booster shots for recipients of the Moderna and Johnson & Johnson vaccines.

Michael Regan, the E.P.A. administrator, wants to limit a class of chemicals that has been linked to cancer and is found in everything from drinking water to furniture.

People who have received the company’s one-shot vaccine may benefit from a booster with another brand. F.D.A. advisers will discuss the data on Friday.

Deaths among people who have been fully vaccinated remain rare, but older adults and those with compromised immune systems are at much higher risk.

Colin Powell had a form of blood cancer that saps natural immunity and also undermines the effects of vaccines like the ones used against Covid-19.

The longer you have high levels of “bad” LDL cholesterol, the greater your risk of a heart attack.

Merck has taken a step to make its antiviral pill available in poor nations, but many obstacles remain for broad access to coronavirus drugs.

She was part of a groundbreaking study that observed how very young children separated from their mothers. Late in life, she became a photographer’s muse.

Police should see vaccination as the best way to protect themselves on the job, Fauci says.

The former president was admitted to a California hospital on Tuesday for treatment of an infection that developed into sepsis, officials said.

“It causes huge distress to tell a family, ‘We can’t serve you,’” said one state hospice organization director.

Coronavirus testing prices vary widely and can reach into the hundreds of dollars, making it hard for some travelers to budget for the added expense.

But many panel members said J. & J. recipients might also benefit from the option of a Pfizer-BioNTech or Moderna booster, an action that an F.D.A. official said was possible.

The actress puts herself out there in “Introducing, Selma Blair,” an unflinching documentary that she hopes can help others.

The actress, 50, who has Stage 4 cancer, said she posted the photos to help raise awareness about breast cancer prevention.