The FDA’s authorization of the reformulated COVID-19 booster shots represents a major step in the effort to get more Americans boosted.

Early on, public health messaging focused on the need for vaccines to combat COVID-19. But far less attention has been given to the role of boosters in preventing deaths and reducing inequities.

COVID-19 vaccine mandates were associated with more nursing home staff getting the jab, but not more choosing to leave their jobs rather than comply.

News reports about polio's return worry parents. An expert explains the two types of poliovirus and the importance of herd immunity.

Despite knowing the risks of COVID-19, breakthrough infections, and long COVID, US adults are less and less likely to take precautions, a survey finds.

The need to keep vaccines cold makes global shipping a challenge. Researchers say their hydrogel approach could change that.

Declaring monkeypox a national health emergency will allow the U.S. government to direct resources and funds where needed to help slow the spread of the virus.

There are two approved monkeypox vaccines in the US. Both use a related poxvirus called vaccinia to produce an immune response that protects against smallpox and monkeypox.

"There are no new, large mutations that could account for the change in [monkeypox] transmission," says virologist Heather Koehler.