Serbia’s vaccination rate (MCV1) is down from 95% in 2010 to 82% in 2016. That is roughly on par with where it was during the height of the war. Romania fell from 95% to 86% in the same period. Both of those started high enough for herd immunity and fell below the threshold. In contrast Hungary held steady at 99%. You have a point with Ukraine. Their drop in vaccination matches up with the violence.
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