Tornado Alley (PROG)

[SoxFan]

So did they also include what was stated later by her or is research not to be relied upon if it disagrees with your ignorance?

Later, facing a rash of criticism, the university on July 16 added a clarification to the commentary that stated:

“We agree that the data supporting the effectiveness of a cloth mask or face covering are very limited. We do, however, have data from laboratory studies that indicate cloth masks or face coverings offer very low filter collection efficiency for the smaller inhalable particles we believe are largely responsible for transmission, particularly from pre- or asymptomatic individuals who are not coughing or sneezing. At the time we wrote this article, we were unable to locate any well-performed studies of cloth mask leakage when worn on the face—either inward or outward leakage. As far as we know, these data are still lacking.”

The evidence that does exist comes both from laboratory studies and real-world scenarios.

For example, one recent laboratory experiment used laser lights to visualize respiratory droplets expelled by test subjects who repeated the phrase “stay healthy.” Each time the subjects spoke, their speech generated hundreds of droplets ranging in size from 20 to 500 micrometers. The research concluded that covering the speaker’s mouth with a damp washcloth blocked nearly all of them.

Some of the more compelling research includes a recent study that used publicly available data to calculate the COVID-19 growth rate before and after mask mandates in 15 states and the District of Columbia between the end of March and late May of 2020. Researchers found a significant slowdown in the daily growth rate in those areas and concluded that mask mandates may have prevented up to 450,000 new virus cases.

https://wausaupilotandreview.com/2020/07/27/confused-about-masks-heres-what-the-science-says/