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CDC updates guidances, cites dangers from very fine respiratory droplets

Federal health officials on Friday updated public guidance about how the coronavirus spreads, emphasizing that transmission occurs by inhaling very fine respiratory droplets and aerosolized particles, as well as through contact with sprayed droplets or touching contaminated hands to one’s mouth, nose or eyes.

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Studies: Higher stroke risk linked to asymptomatic COVID-19 in younger men and spread of virus in cars, vans

Men under 50 recovering from asymptomatic COVID have double the likelihood of acute ischemic strokes (AIS) compared with men of the same age without COVID infection, according to a study last week in JAMA Network Open.

Eighteen South Asian men were treated in Singapore for AIS a median of 54.5 days after their initial COVID-19 diagnosis. Twelve (67.7%) had no known pre-existing risk factors. While AIS is a known neurologic complication from symptomatic COVID-19, none of these men experienced respiratory symptoms during their infection.

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ANALYSIS: Five reasons why COVID herd immunity is probably impossible

https://www.nature.com/articles/d41586-021-00728-2

As COVID-19 vaccination rates pick up around the world, people have reasonably begun to ask: how much longer will this pandemic last? It’s an issue surrounded with uncertainties. But the once-popular idea that enough people will eventually gain immunity to SARS-CoV-2 to block most transmission — a ‘herd-immunity threshold’ — is starting to look unlikely.

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