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

The delta variant’s increased infectiousness, coupled with remaining pools of unvaccinated people and those whose immunity has waned, are enough to drive a winter COVID-19 surge even in highly vaccinated parts of the country, a Harvard infectious diseases expert said.

Epidemiologist William Hanage predicts likely decline in U.S. COVID cases, epending on vaccination rates, control tactics, and the absence of variants.

Massachusetts General Hospital study links healthy plant-based foods with lower risks of getting of COVID-19 and of having severe disease after infection.

Despite its ability to transmit more easily and puncture vaccine defenses, the delta variant is no superbug. It is vulnerable to masking, distancing, and other non-pharmaceutical interventions, lessons from delta outbreaks overseas show.

Harvard Associate Professor of Epidemiology William Hanage provides tips on how to deal with the Delta variant of COVID-19.

Robert Blendon examined the divide among Americans over vaccine mandates.

Coronavirus ultimately not over, says Harvard Chan School's William Hanage.

A Harvard Chan School psychologist counseled awareness and flexibility as people return to work, school, or other pre-pandemic activities.

Single-shot COVID-19 vaccine generates robust immune responses against variants.