re: Revisionist History: for all u “proven to work” jacklegs

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But while mandatory in Wuhan, China, where the virus originated, a face mask is of little use, practically speaking, some experts say. "A surgical mask might provide some protection, but it's going to be very modest," said Dr. William Schaffner, a professor of preventive medicine at Vanderbilt University in Nashville, Tenn.

No definitive studies exist that prove masks prevent infections. Also, masks are designed for different purposes, and only some guard against infectious diseases.

Picking the right type of mask may be key, said one researcher.

"Several studies, including research from my group, show that if worn properly, masks can protect people in the community from respiratory illness, especially [those] in close contact with sick people," said Dr. Raina MacIntyre. She's head of biosecurity research at the University of New South Wales in Sydney, Australia.

MacIntyre's group did a study where parents of a sick child wore a mask at home. Those who wore the mask at all times were protected, she said.

"When infection is widespread, it may be useful," she noted.

However, images from China show people wearing face masks that aren't likely to help, MacIntyre said.

"I recommend disposable masks," she said. "The cloth masks used commonly in China may not be protective. We did a trial of these, compared to disposable masks, and wearers had a higher risk of infection. This may be because the cloth masks are not washed regularly and may retain moisture and become contaminated."

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