CDC reverses itself and says guidelines it posted on coronavirus airborne transmission were wrong - 2020-09-21
The agency had posted information Friday stating the virus can transmit over a distance beyond six feet, suggesting that indoor ventilation is key to protecting against a virus that has now killed nearly 200,000 Americans.
The CDC shifted its guidelines on Friday, but the change was not widely noticed until a CNN report on Sunday. Where the agency previously warned that the virus mostly spreads through large drops encountered at close range, on Friday it had said "small particles, such as those in aerosols" were a common vector.
But Jay Butler, the CDC's deputy director for infectious disease, said the Friday update was posted in error. "Unfortunately an early draft of a revision went up without any technical review," he said.