Why the U.S. Is Underestimating Covid Reinfection

As millions of Americans struggle to recover from covid and millions more scramble for the protection offered by vaccines, U.S. health officials may be overlooking an unsettling subgroup of survivors: those who get infected more than once. Identifying how common reinfection is among people who contracted covid — as well as how quickly they become vulnerable and why — carries important implications for our understanding of immunity and the nation’s efforts to devise an effective vaccination program.

Read more at Kaiser Health News.