immunity

Researchers found that a class of antibodies in a monkey's blood provides protection from COVID-19. If that hold true for humans, a blood test may predict whether a vaccine candidate is working.

More than 440,000 people have recovered from COVID-19 — and their status is an important question. If people are immune after recovery, they could resume normal life activities more quickly.

Among the questions this week: Can you get COVID-19 more than once? What's the maximum surface area that can be treated with one disinfecting wipe?

The hope is that a person who's recovered from COVID-19 would have some protection against re-infection in the future. Here's what researchers do — and don't — know.