Conversation

"The tally of people infected with the coronavirus after attending a high-profile Centers for Disease Control and Prevention conference in April has risen to at least 181"

The CDC did not require masks, or do anything to keep the air clean.

Meanwhile, a science fiction con called Wiscon requires masks, puts an air purifier in every room, limits eating & drinking (because masks). With those measures, they only had 13 cases out of 407 attendees.

https://www.washingtonpost.com/health/2023/05/26/cdc-covid-outbreak/