Natural immunity in Portugal

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Rise of natural acquired immunity.

Risk of BA.5 Infection among Persons Exposed to Previous SARS-CoV-2 Variants.

https://www.nejm.org/doi/full/10.1056…

https://www.nejm.org/doi/suppl/10.105…

Omicron subvariants, BA.1 and BA.2, displaced by BA.5 in many countries. Greater transmissibility. Partial evasion of BA.1- and BA.2-induced immunity.

Portugal, one of the first countries affected by a BA.5 predominance.