THE SCIENCE ISN’T SETTLED UNTIL WE SAY IT’S SETTLED: The W.H.O. walked back an earlier assertion that asymptomatic transmission is ‘very rare.’

A top expert at the World Health Organization on Tuesday walked back her earlier assertion that transmission of the coronavirus by people who do not have symptoms is “very rare.”

Dr. Maria Van Kerkhove, who made the original comment at a W.H.O. briefing on Monday, said that it was based on just two or three studies and that it was a “misunderstanding” to say asymptomatic transmission is rare globally.

“I was just responding to a question, I wasn’t stating a policy of W.H.O. or anything like that,” she said.

Dr. Van Kerkhove said that the estimates of transmission from people without symptoms come primarily from models, which may not provide an accurate representation. “That’s a big open question, and that remains an open question,” she said.

Well, okay then.