https://abs.twimg.com/emoji/v2/... draggable="false" alt="⚠️" title="Warnsignal" aria-label="Emoji: Warnsignal">Worrisome. After 44%-66% of people in Manaus #Brazil got the #coronavirus in May-August, the death toll plummeted, likely due to herd immunity.

Deaths are now rising.

Antibodies waned after just a few months, potentially explaining the resurgence. https://www.reuters.com/article/us-health-coronavirus-brazil-manaus-idCAKBN26I0I4">https://www.reuters.com/article/u...

“It’s a bit premature to speak of herd immunity from a new disease that we are still learning about, but we are seeing people with mild ( #COVID19) cases that appear to have antibody immunity that can last for 2-3 months.”

Very concerning for a #vaccine or natural herd immunity.

“Something that became evident in our study—and that is also being shown by other groups—is that antibodies against #SARSCoV2 decay quickly, a few months after infection.

This is clearly occurring in Manaus.”

NOT GOOD.

#coronavirus #COVID19

Bottom line: Immunity to the #coronavirus, as measured by antibodies, may wane quickly after a mild infection.

The big question is whether any immunity provided by a #vaccine will be long-lived.

Time will tell.https://abs.twimg.com/emoji/v2/... draggable="false" alt="🙏" title="Folded hands" aria-label="Emoji: Folded hands">

#COVID19
https://twitter.com/drdenagrayson/status/1310935949568860160?s=21">https://twitter.com/drdenagra... https://twitter.com/drdenagrayson/status/1310935949568860160">https://twitter.com/drdenagra...