Two VERY striking pieces from Eugyppius

On the fact that the German states with low vaccination rates (basically the former East Germany) have now MUCH lower Omicron infection rates than the rest of the country:

eugyppius: a plague chronicle
Omicron BA.5 Prefers Hypervaccinated Masking West Germans, Avoids the Former DDR
Behold the latest map of 7-day Corona incidence across the Federal Republic of Germany: This is the Omicron BA.5 wave in central Europe, and it is attended by a curious phenomenon: Every day, you can see more clearly the borders of the old DDR in the district-level data. I’ve traced these in green just to make the phenomenon clearer…
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And a newer piece that looks at the same trends since last fall and makes the same point even more strongly. Last fall, as Germany was just leaving the happy vaccine valley (Germany started vaccinating relatively late), area with higher vaccination rates had fewer Covid cases - the numbers in the former East Germany looked bad. But Omicron erased that trend, and now it has markedly reversed.

eugyppius: a plague chronicle
SARS-2 Didn't Care About DDR Borders Until the Vaccines
In the aftermath of my suggestion that Omicron BA.5 prefers hypervaccinated west Germans and avoids the lesser-vaccinated former DDR, I’ve heard a lot of theories. I’ve heard about demography and age structures and population density and testing and masking rates, about the timing of third and fourth vaccine doses, and about many other things…
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The mRNA vaccinated countries are so very lucky that Omicron is mild.

Let’s hope that luck holds.