COVID-19, experts say.This is partly due to the risk of transmission by asymptomatic people — those who have the novel coronavirus, but aren’t showing any symptoms.This is playing a role in the spread of COVID-19, the World Health Organization said Tuesday, clarifying some remarks they made just a day before suggesting that it only made a small difference. “Some estimates of around 40 percent of transmission may be due to asymptomatic (cases), but those are from models.
So I didn’t include that in my answer yesterday but wanted to make sure that I made that clear,” said Dr. Maria van Kerkhove, a WHO epidemiologist and technical lead on the pandemic.Here’s what we know, and don’t know, about the phenomenon so far.Dr.