The first lady first tested positive on Aug. 16 and she remained in isolation for five days, undergoing a course of Paxlovid treatment. She tested positive again Wednesday and does not have symptoms.
Paxlovid has been highly effective at reducing the risks of hospitalization and death, but some patients report a "Paxlovid rebound" in which the disease returns.
People who catch COVID may feel as if they won't get it again, at least not for a long time. Their immune system should be primed to fight it off in the future. Right? Well, let's see.