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Why do I get a cough and cold after returning from BKK?

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I think people wearing cheap face masks are breathing the same air as the rest of us



I'm not an expert, but these people are:

https://www.ncbi.nlm.nih.gov/pubmed/9487666

"Performance of N95 respirators: filtration efficiency for airborne microbial and inert particles"

which concludes with:

"N95 respirators provide excellent protection against airborne particles when there is a good face seal."

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