TOPLINE
The Centers for Disease Control quietly
updated its guidance on Friday for coronavirus transmission—now saying that the virus can be transmitted via aerosols as well as larger droplets—and is the agency’s latest update for managing the virus, among earlier controversial reversals on the wearing of masks, who can get tested and the reopening of businesses.
KEY FACTS
The
Washington Post reported that although the CDC updated its guidance to mention aerosols on Friday, it was not widely noticed until CNN
reported on it Sunday.
Before Friday’s update, the CDC said large respiratory droplets (like from coughing or sneezing) at close range transmitted the virus, but
now adds “small particles, such as those in aerosols” can infect people.
“There is growing evidence that droplets and airborne particles can remain suspended in the air and be breathed in by others, and travel distances beyond six feet,” the CDC now advises.
Poorly ventilated indoor spaces, like choir practices or fitness classes, can be particularly risky for virus transmission, the CDC’s guidance adds.
Scientists say the new CDC guidance is important because cloth masks aren’t designed to protect the wearer from aerosols.
The World Health Organization publicly addressed the threat of aerosols in July at the urging of hundreds of scientists, and according to the
Post, it’s unclear why the CDC is following suit months later.
CRUCIAL QUOTE
“This is a good thing, if we can reduce transmission because more people understand how it is spreading and know what to do to stop it,” University of Boulder-Colorado chemistry professor Jose-Luis Jimenez told the
Post.