While Germany has high vax rate (67% fully vaxxed) it's concentrated among older individuals, and little coverage among kids. So, it has big pockets of low coverge. Germany has not authorized vax for under 11, and only authorized 12-17 in Aug when Delta first started to tick up
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And the social and geographic areas of under-vaccination are concentrated in specific regions (especially the Eastern part of Germany) so that reality makes it even easier for delta to get into the pockets of vulnerability and cause the dense, concentrated outbreaks we're seeing
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Now do Michigan.
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One question that's puzzled this ID doc/virologist is what proportion/size of the population would need to be unvaccinated to allow variants to fluorish, a question that involves mutation rates, transmission rates, etc, or is replication in 1 immunosuppressed host enough
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