Health Apr 24

COVID-19 vaccinations are at a critical juncture as companies test whether new approaches like combination shots or nasal drops can keep up with a mutating coronavirus — even though it’s not clear if changes are needed.

Health Mar 29

U.S. regulators are allowing people 50 and older to get another booster dose of the Pfizer or Moderna COVID-19 vaccine.

Health Mar 23

Early study results released Wednesday by Moderna suggest the two small doses work in tots younger than 6.

Health Mar 23

The pharmaceutical company said in the coming weeks it would ask regulators in the U.S. and Europe to authorize two small-dose shots for youngsters under 6.

Health Mar 15

If the government approves the request, made by the company Tuesday, a key question would be how soon seniors would be advised to roll up their sleeves, given that cases currently are dropping.

Health Mar 01

A new government report shows Pfizer's COVID-19 vaccine gave children 5 and older strong protection against hospitalization and death even during the omicron surge.

Nation Feb 01

Pfizer on Tuesday asked the U.S. to authorize extra-low doses of its COVID-19 vaccine for children under 5, potentially opening the way for the very youngest Americans to start receiving shots as early as March.

Health Jan 25

Pfizer and BioNTech have begun studying a COVID-19 vaccine tweaked to match to the omicron variant in healthy adults.

Health Jan 20

U.S. researchers are reporting the latest in a surprising string of experiments in the quest to save human lives with organs from genetically modified pigs.

Health Jan 10

Researchers tracked nearly 4,000 U.S. women through six menstrual cycles and found a small and temporary change: The next period after a shot started about a day later than usual. But there was no change in the number of days…