Many doctors have used antibiotics to treat COVID-19 patients, but that's largely unnecessary — and could even promote drug-resistant germs.

Infusing blood plasma from people who have recovered from COVID-19 into sick patients looks good on paper. But studies of the treatment haven't found benefits.

In 1721, London was in the grips of a deadly smallpox epidemic. One woman learned how to stop it, but her solution sowed political division.

Exposing people to a potentially fatal disease could hasten understanding of COVID-19 and development of new vaccines and treatments. But the risks of such studies raise serious ethical questions.

The Code Breaker profiles Jennifer Doudna, a Nobel Prize-winning biochemist key to the development of CRISPR, and examines the technology's exciting possibilities and need for oversight.

The third COVID-19 vaccine authorized for use in the U.S. requires one shot instead of two, and works a slightly different way from the others. Here's what we know about its safety and effectiveness.

Nonwhite Americans looking for care for a loved one are much more likely than whites to encounter discrimination, language barriers, and providers who lack cultural competence, a new report finds.

In the future, different circumstances will likely determine which vaccine or booster a person receives, based on their antibodies — and which variant is common in their region.

Sepsis is one of the most common causes of death for hospitalized patients. The search for an effective treatment has been frustrating.

Researchers are trying to learn more about COVID-19 vaccines from original study participants. The quest is hampered because many people who first received a placebo shot are opting for the vaccine.

Even when forced online by the pandemic, music therapy sessions continue to help patients in some ways talk therapy can't. "Music is this portal," says one therapist and COVID-19 long-hauler.

Lab-grown brainlike organoids altered with an ancient gene began to look and behave differently. The experiments help show how the human brain has evolved.

The Food and Drug Administration is working on a playbook for how it could greenlight vaccine tweaks. Studies in hundreds of people, rather than tens of thousands, seem likely.

Supply shortages of oxygen for hospitals have plagued many countries, but the U.S. has averted the most dire — partly because the industry figured out new ways to share resources and anticipate needs.

The spread of new strains raises new questions as two COVID-19 vaccines continue their rollout across the U.S. and another vaccine candidate preps for regulatory review. Here's what you need to know.