Nurses who identify as Democrats have a significantly higher likelihood of having their children vaccinated against COVID-19 than those who identify as Republicans.

The CDC updates its 2016 opioid prescribing guidelines, to emphasize flexibility over rigid practices and laws whose aim is to reduce addiction.

The FDA’s authorization of COVID-19 shots for children ages 6 months to 4 years will bring relief for millions of parents. Pending CDC endorsement, shots for this group will be available within days.

Five former CDC directors convened for a panel about the future of the agency.

As mask mandates fall and the CDC issues new mask guidance, kids may experience anxiety around removing their masks. Clear communication from grown-ups can help children navigate the uncertainty.

The CDC’s updated mask guidelines say that cloth masks offer the least protection from COVID-19. Differences in the materials masks are made from and the ways they fit are the reason.

Conversations with Harvard experts shed light on the rise of Delta, an unwelcome twist in transmission, the power of vaccination, and more.

How well your mask works depends on how well it fits. Wearing two snug masks made of different materials offers 95% protection from exposure to aerosols that could contain the coronavirus.

Despite worries that a new coronavirus variant may be able to evade vaccines just being distributed, a Harvard public health expert expressed confidence in the same technology that produced the vaccines in record time.