It's called asymptomatic spread. Recently a scientist with the World Health Organization created confusion when she seemed to suggest it was "very rare." It's not, as the WHO attempted to clarify.NPR science reporter Pien Huang) explains what scientists know about asymptomatic spread, and what might have caused the WHO's mixed messages. Email the show at [email protected]).Learn more about sponsor message choices: podcastchoices.com/adchoices)NPR Privacy Policy)
