Police guard Polio vaccination team, during a three-day vaccination campaign in Karachi, Pakistan, 24 October 2016. Pakistan is one of the last two countries, along with Afghanistan, where polio is still endemic. Though new polio cases dropped to a nine-year low in 2016, attacks by Islamist militants against health workers and police guarding them remained a challenge for a UN-funded vaccination campaign. (Photo by Shahzaib Akber/EPA)
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