Throughout the pandemic, health experts have tended to set the magic number for herd immunity between 50% and 70% — with most, including Dr. Anthony Fauci, the head of the National Institute of ...

Vaccine-induced immunity and natural immunity are both types of active immunity. That’s the medical term for when you’re exposed to something that spurs your immune system to make antibodies ...

"Hybrid immunity" seems to be the most durable type, but it comes with the obvious downside that one has to develop COVID-19 before one can get it, Dr. Gallagher states.

Hnida said different vaccines can give a patient what's called a "stacked immunity" and he says it would not surprise him if mixing and matching vaccines becomes a recommended method down the line.