CDC Issues a Health Alert About Parvovirus: What Is It?

Published on August 14, 2024

The U.S. Centers for Disease Control and Prevention (CDC) issued a health alert on Wednesday about an increase in human parvovirus B19 infections. Between 2022 and 2024, only around 3 percent of the U.S. population had immunoglobulin M (IgM) antibodies to parvoviruses, indicating that only that amount of the population had been infected with parvovirus. But in June 2024, the number grew to 10 percent. IgM antibodies are immune proteins the body produces after a recent encounter with a virus or bacteria. Children aged 5 to 9 had the most significant increase in infections, rising from 15 percent to 40 percent. Parvovirus B19 is a seasonal respiratory virus; infections usually occur in late winter, spring, and early summer. The virus is highly contagious and transmitted through respiratory droplets, nasal mucus, and saliva....