On a positive note : If you are once infected and recover, the antibody will give you at least 8 months of protection. Finds Australian researchers. Note "at least". Might be more.
Second note is that 50% of the residents of Dhaka were infected, silently or not, as of Sep 2020. Might be more by now.
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https://www.rt.com/news/510631-australia-study-covid-immunity-vaccines/