This is the fourth video in a series on viruses, focusing on the coronavirus.

Once your body is infected with a virus, how does your immune system react to neutralize the threat? Furthermore, why is it that we get re-infected with the same virus year-in and year-out (think of viruses like influenza, or the coronavirus).

In this video we take a look at how the immune system operates in order to combat viruses.

For more information on the biology of viruses, visit www.evo-ed.org.

Support for this work was provided by the National Science Foundation's Division of Undergraduate Education program under Award No. DUE2020221