Angelica Lavito Bloomberg

Don't wait to get a booster shot. That's the overwhelming advice from 15 vaccine experts, infectious disease doctors and public-health officials after the rise of the new omicron variant sent vaccine makers rushing to revamp their shots

Advisers to the Centers for Disease Control and Prevention are under pressure to decide whether the U.S. can resume use of Johnson & Johnson's Covid-19 vaccine, perhaps with some limits, 10 days into a pause on using it.

U.S. health officials urged a pause on the use of Johnson & Johnson's Covid-19 vaccine due to dangerous blood-clotting to give them time to educate doctors on how to treat the exceedingly rare disorder.

The first known allergic reaction to the Pfizer Inc. Covid-19 vaccine in the U.S. was reported in Alaska as some snarls began to emerge in the effort to send the shots across the country, highlighting the daunting challenges ahead for a historic immunization drive.

The dose of AstraZeneca Plc's Covid vaccine that showed the highest level of effectiveness was tested in a younger population than a bigger dose that showed less efficacy, according to the head of the U.S. Operation Warp Speed program.

Don't wait to get a booster shot. That's the overwhelming advice from 15 vaccine experts, infectious disease doctors and public-health officials after the rise of the new omicron variant sent vaccine makers rushing to revamp their shots

Advisers to the Centers for Disease Control and Prevention are under pressure to decide whether the U.S. can resume use of Johnson & Johnson's Covid-19 vaccine, perhaps with some limits, 10 days into a pause on using it.

U.S. health officials urged a pause on the use of Johnson & Johnson's Covid-19 vaccine due to dangerous blood-clotting to give them time to educate doctors on how to treat the exceedingly rare disorder.

The first known allergic reaction to the Pfizer Inc. Covid-19 vaccine in the U.S. was reported in Alaska as some snarls began to emerge in the effort to send the shots across the country, highlighting the daunting challenges ahead for a historic immunization drive.

The dose of AstraZeneca Plc's Covid vaccine that showed the highest level of effectiveness was tested in a younger population than a bigger dose that showed less efficacy, according to the head of the U.S. Operation Warp Speed program.