William Hanage, an associate professor of epidemiology, talks about hybrid protection, vulnerability of older people, and the wisdom of Taylor Swift.

Harvard faculty discuss changes to views on school, work, winter’s likely surge, danger of "lethal inflexibility."

Early findings on immune escape and transmissibility, combined with danger posed by Delta, heighten urgency of vaccination, testing, other safety measures.

Mary Bushman, a research fellow in the Department of Epidemiology at Harvard Chan School, co-authored a recent paper that modeled variant threats.

Marc Lipsitch, an epidemiologist and director of the Harvard T.H. Chan School of Public Health’s Center for Communicable Disease Dynamics, says COVID vaccines for children should not be rushed and a return to in-person learning can still be navigated.

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.

Can the current crop of vaccines get us to herd immunity even if variants become widespread? A Harvard immunologist says yes.

A Harvard epidemiologist said the forces of seasonality, slowly rising immunity, and shifting personal behavior will likely create a viral variant landscape with regional spikes in the months to come rather than a uniform national wave.

With new coronavirus variants on the U.S. pandemic scene, experts say brace yourself for another surge — and mask up.

Harvard Medical School Professor Dan Barouch said the “complicated pandemic” means more work lies ahead.