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Police guard Polio vaccination team, a day after seven policemen who were on security duty to Polio vaccination team were killed by unknown gunmen in Karachi, during a three-day vaccination campaign in Karachi, Pakistan, 21 April 2016. Pakistan is one of the last two countries – along with Afghanistan – where the polio is still endemic, meaning infections occur within the local population or within a particular area. Though new polio cases dropped to a nine-year low in 2015, attacks by Islamist militants against health workers and police guarding them remained a challenge for a UN-funded vaccination campaign. Only 51 children were found infected with the crippling virus in 2015 compared to 306 a year earlier in what officials said a major achievement due to the success of a military offensive. (Photo by Shahzaib Akber/EPA)
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