AP Medical Writer One year ago, the biggest vaccination drive in American history began with a flush of excitement in an otherwise gloomy December. Trucks loaded with freezer-packed vials of a COVID-19 vaccine that had proved wildly successful in clinical trials fanned out across the land, ...

Associated Press CHICAGO — As the omicron variant sparks worldwide fears of renewed COVID-19 outbreaks, Americans’ worries about infection are again on the rise, but fewer say they are regularly wearing masks or isolating compared with the beginning of the year. A new poll conducted by ...

AP Science Writer Nearly two years into the COVID-19 pandemic, the origin of the virus tormenting the world remains shrouded in mystery. Most scientists believe it emerged in the wild and jumped from bats to humans, either directly or through another animal. Others theorize it escaped ...

AP Health Writer WASHINGTON — Federal health officials on Wednesday authorized a new COVID-19 antibody drug for people with serious health problems or allergies who can’t get adequate protection from vaccination. Antibody drugs have been a standard treatment for treating COVID-19 ...

AP Medical Writer Pfizer said Wednesday that a booster dose of its COVID-19 vaccine may offer important protection against the new omicron variant even though the initial two doses appear significantly less effective. Pfizer and its partner BioNTech said that while two doses may not be ...

Associated Press U.S. health officials said Sunday that while the omicron variant of the coronavirus is rapidly spreading throughout the country, early indications suggest it may be less dangerous than delta, which continues to drive a surge of hospitalizations. President Joe Biden’s chief ...