See thread, explaining new study: much higher transmissibility for Omicron on top of antibody evasion causing more breakthroughs and re-infections. Do note that even if milder due to immunity and/or lesser intrinsic virulence, still crucial especially for elderly to get boosters.https://twitter.com/mugecevik/status/1471088936999137281 …
South Africa had a huge prior outbreak with Delta, so may provide a road map for similar countries but not all others.
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Also a very low vax rate and a high prevalence of HIV
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