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Unfortunately there's a massive outbreak in Syria right now, big enough I was encouraged to get a booster shot before I went to Israel.

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Only if you consider 17 cases in the past year "massive" and no cases in the last 3 months.

http://www.polioeradication.org/Dataandmonitoring/Poliothisw...

In 2013 polio came through Egypt (probably) to Israel and Syria. Israel had to return to regular OPV when regular sewage tests returned positive, but no case of infection was reported.

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