Health experts have warned that the recent outbreak of polio in Syria poses a serious threat to Europe, where the disease was eradicated in 2002. Europe is exposed because some countries have low rates of innoculation, which lowers "herd immunity", or protection through community-wide vaccination, a pair of German epidemiologists warned in The Lancet. In addition, most countries use a type called inactivated polio vaccine (IPV), which is less effective ...
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