Omicron has many more mutations than previous variants of concern, a fact that raises questions about how effective existing vaccines will be against the new form of the coronavirus.

As he prepares to leave his post of 12 years, Francis Collins reflects on the agency's biomedical advances, the dangers of polarizing medicine and the huge health gaps that still exist in the U.S.

Community leaders saw early in the pandemic that the city's residents of color were being hit hard by COVID-19. They worked with data analysts to show just how hard, where and why.

As the Supreme Court considers a case that could overturn Roe v. Wade, Texas enacted a new law imposing criminal penalties for those who prescribe medication abortions via telehealth or the mail.

Pfizer researchers looking for a drug to treat SARS found clues that gave the company a head start in its quest for a pill to treat COVID-19, including the omicron variant.

Protein subunit vaccines work by injecting people with a tiny portion of a virus. In the case of the COVID-19 vaccine, that tiny portion is the spike protein that the coronavirus uses to enter cells.

If the Food and Drug Administration authorizes use of the drug, called molnupiravir, it would be the first oral COVID-19 treatment that could be taken at home.

The FDA is considering new pills that could treat people in early stages of COVID. Here's what to know about how they work, how effective they are and the impact they could make on the pandemic.

When it comes to receiving organ transplants, patients are not usually judged on prior behavior, but some doctors are questioning whether unvaccinated COVID patients should qualify for new lungs.

The second time Vanessa Quintero's family caught the virus, probably from her 8-year-old daughter, fewer people got sick. They and their doctors credit the protection of vaccination.

Now that travel is picking up again, research on the fictional spy's travel practice provides helpful reminders to would-be adventurers about what not to do if you're contemplating a trip.

Booster shots have been authorized for all U.S. adults, and the government is urging people to get them. But what if you've already had COVID and the vaccine?

State rules were temporarily loosened in 2020 to help patients get care outside a doctor's office. But is telehealth by phone safe and effective? State legislatures and insurers must soon decide.

Health and Human Services Secretary Xavier Becerra says health providers who have exploited a complicated system to charge exorbitant rates will have to bear their share of the cost — or close.

COVID-19 has twice struck a Latino family living in a multi-generational setting in the San Francisco Bay Area, underscoring the importance of vaccination for the sake of all household members.