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No. All recent data points to long-lasting immunity. A normal, gradual decline in antibody response is coupled with longer-lasting B- and T-cell response.

https://threadreaderapp.com/thread/1285618977654407169.html

https://www.medrxiv.org/content/10.1101/2020.07.14.20151126v...

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How does that explain repeat illness (not via testing but someone that is in hospital once month and back the next?)

To date, there has been one documented case of re-infection. From everything we know, this very rare.

There are many reasons a person with a severe illness might have to return to a hospital (e.g. lung damage from ventilators), but this has no relationship to repeated infection from the same virus.

Multiple (confirmed) cases, meaning there are many more that are missed. https://www.statnews.com/2020/08/28/covid-19-reinfection-imp...

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