Why viral reservoirs are a prime suspect for long COVID sleuths

Brent Palmer’s first inkling about long COVID started in the early days of the pandemic, before the term “long COVID” even existed. Some of his friends had caught the virus while on a ski trip and returned home to Colorado with the mysterious, new illness. It was a frightening time — and an irresistible opportunity for Palmer, [an associate professor of medicine] who studies the immune response to infectious diseases like HIV.