Parents in the United States who want to vaccinate their young children against Covid-19 this fall may face a growing set of ...

COVID-19 activity is rising in much of the country. Data shows overall respiratory virus spread is very low in the U.S.

Coronavirus infections are climbing again, marking another summer wave as children go back to school. But this uptick arrives with an added layer of uncertainty because it’s unclear when and which ...

Pfizer also said it is working to improve its existing vaccine formulation, developed jointly with Germany's BioNTech, based on the vaccine's reaction to new COVID-19 variants that arise.

People with weakened immune systems who received the Pfizer or Moderna vaccines can also get their third dose of a COVID-19 vaccine if it's been at least four weeks since the second dose (and ...

Pfizer’s clinical trials in children 5 to 11 did not measure the vaccine’s effectiveness against COVID-19. Effectiveness was “never the intended primary endpoint,” Anderson said.

London — U.S. drugmaker Pfizer said Monday that human trials suggest its coronavirus vaccine is 90% effective at preventing COVID-19 infections in people not known to have had the virus ...

A technician inspects vials of coronavirus disease (COVID-19) vaccine candidate BNT162b2 at a Pfizer manufacturing site in manufacturing site in St. Louis, Missouri, U.S. in an undated ...

Pfizer got such a quick indication that its coronavirus vaccine is highly protective against infection in part because the pandemic is so bad, Fauci said. The data was revealed as part of what’s ...

Coronavirus infections are climbing again, marking another summer wave as children go back to school. But this uptick arrives with an added layer of uncertainty because it’s unclear when and which ...