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Coronavirus

Why and how face masks are effective in limiting Covid spread

"For the airborne transmission of SARS-CoV-2, we find that usually just a minor fraction of exhaled respiratory particles contains viruses. Most environments and contacts are under virus-limited conditions, wear face masks, including simple surgical masks, have a high efficacy in preventing the spread of Covid-19."

Sniffer dogs show 88% accuracy in detecting Covid: UK study

Some of the people in the negative group had common cold viruses, to make sure the dogs were able to distinguish Covid from other respiratory infections. The dogs were able to sniff out the disease even when it was caused by different variants.