The Pakistan Cricket Board said in a statement that the players had taken the anti-polio vaccine drops to support the UNICEF's polio immunization programme and to create awareness about the devastating impact of the virus but a source said the drops were also administrated since the Pakistan team has to travel in late July to Sri Lanka.
Today, a sixth polio case was discovered in Karachi this year.
Officials said the victim belonged to a family that lived in union council-9, Kunwari Colony of the SITE Town.
"Her family did not allow her to be administered a single booster during our frequent campaigns, like a 20-month-old girl of Sultanabad (Gadap) who had the same fate two weeks ago," said a senior health official.
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Of the six polio cases detected so far in the city, three were reported in Gadap alone, while one each belonged to Baldia, Orangi and SITE.
The WHO has imposed restrictions on Pakistani travellers, saying they have to be administrated anti-polio drops at airports before checking into immigration and can't travel without the required certificate.