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TL;DR city in Brazil had a ~76% immunity, but after 7-8 months an unexpected new insurgence happened. The researchers see 4 possible explanations: (1) overestimation of the immunity (taken from blood donations), (2) immunity doesn't last 7-8 months (previous UK study confirmed immunity lasted 6 months but didn't test longer), (3) new strains overrule immunity of old strains and (4) new strains are just generally more contageous so R0 is higher

thelancet.com/journals/lancet/

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