Consuming higher amounts of vitamin D – mainly from dietary sources – may help protect against developing young-onset colorectal cancer or precancerous colon polyps, according to the first study to show such an association.

Investigators who developed the COVID-19 Simulator say the delta variant’s high transmissibility, low vaccination coverage in several regions, and more relaxed attitudes to social distancing will likely lead to a surge in COVID-19–related deaths in at least 40 states.

Researchers have found strong evidence of an association between exposure to fine particulate air pollution from 2020 wildfires in the U.S. and increased risk of COVID-19 cases and deaths in three western states, for up to four weeks after the exposure.

Peter Huybers, a professor of Earth and planetary sciences, explains the recently released UN report on climate change and the harrowing details contained within it.

Immunologist Yonatan Grad explains what has been learned from COVID-19 and how to apply the lessons moving forward.

New study suggests practical strategies to help children through a pandemic.

A new study found that COVID-19 messages tailored to Black audiences and presented by physicians of color did not enhance the effectiveness for minority participants.

Citing COVID threat, researchers urge policy changes to ease prison crowding. New study recommends early release for inmates at low risk of reoffending.

Researchers have now created a simple, inexpensive diagnostic test that allows users to test themselves for multiple variants of the SARS-CoV-2 virus at home, using just a sample of their saliva.

Dan Barouch, Harvard Medical School professor and head of Beth Israel Deaconess’ Center for Virology and Vaccine Research, was awarded Harvard’s George Ledlie Prize for work that culminated in one of three vaccines against COVID-19 approved for use in the U.S.