COVID-19 Vaccine Record Card and mask

Proof of COVID-19 Vaccination

Patients of Beth Israel Lahey Health vaccination clinics can request written confirmation of their COVID-19 vaccination. Find details on your clinic here.

What is a Super Spreader Event?

Super spreader events occur when rates of transmission are higher due to a combination of the amount of virus carried by the infected individual and the environmental conditions. Learn more.

What is herd immunity? graphic

What is Herd Immunity?

Herd Immunity describes a situation when enough of the population is immune to a disease—either through vaccination or previous illnesses—to make its spread within a community unlikely. Learn how this applies to COVID-19.