How does our immune system respond to COVID?

Three Boston-area studies dove into the intricacies of the human immune system and how it responds to the virus, my colleague Martin Finucane reported.

In one, researchers looked at 73 antibodies made by people who had been infected by the original strain of COVID to see how they performed against variants. The second investigated immune recall, the process of summoning memory cells into action to fight a pathogen. And the final study tried to better understand CD4+ T cells in battling COVID.