Early data suggests the omicron variant may be better able to evade vaccine antibodies than other variants. But several infectious disease experts caution that these findings don't provide a complete picture of omicron's ability to escape vaccine-induced immunity, and that vaccinated people will likely remain protected against severe outcomes.

Writing for the New York Times, Aaron Carroll, a pediatrician, professor of pediatrics at Indiana University, explains why Americans should be given at-home Covid-19 tests "week after week, free of charge"—and how doing so can help hasten the end of the pandemic.

FDA and CDC on Thursday opened up booster doses of Pfizer-BioNTech's Covid-19 vaccine to 16- and 17-year-olds—and as additional doses become more widely available, some public health experts say the definition of "fully vaccinated" should be updated to require boosters.

Two new studies published Wednesday in the New England Journal of Medicine examine just how much of a difference a booster dose of the Pfizer-BioNTech vaccine makes in terms of Covid 19-related infection, severe illness, and death.

The United States invests an additional $315 million to help deliver and administer vaccines in low- and middle-income countries, efficacy data for Pfizer-BioNTech's vaccine in children under five may be ready by the end of the year, and more in this week's roundup of Covid-19 news.

How to make photosynthesis more efficient, why WHO skipped two letters of the Greek alphabet when they named omicron, and more.

Despite a White House veto threat, the Senate voted to abolish the Biden administration's vaccine mandate for businesses with at least 100 workers, in today's bite-sized hospital and health industry news from the District of Columbia and Ohio.