Previous population immunity and Covid-19 severity with Omicron variant in South Africa.

Population Immunity and Covid-19 Severity with Omicron Variant in South Africa – New England Journal of Medicine

Audio Interview: Understanding the Omicron Variant of SARS-CoV-2

Commentary on Twitter

In Gauteng, South Africa, where the omicron variant was first identified, two thirds of unvaccinated residents were seropositive for SARS-CoV-2, which indicates past infection. Omicron peaked just 1 month after being detected. #COVID19 https://t.co/Z8qTI1DNkv pic.twitter.com/ZZv2xevacG

— NEJM (@NEJM) February 23, 2022