Two new cases were reported from the Federally Administered Tribal Areas (FATA) and one each from Balochistan, Khyber-Pakhtunkhwa (K-P) and Karachi, according to the National Institute of Health Laboratory.
In Balochistan, a 23-month-old boy, whose uncle heads a local Islamic seminary and vehemently opposes polio vaccination campaigns, has been infected with the virus.
His family thinks "polio drops are part of a Western campaign to control Muslim population," said a NGO official working in the area.
"Right now, a massive polio outbreak is sweeping across the country. Worldwide, nearly nine out of every 10 children paralysed by polio live in Pakistan," Chan was quoted as saying by the media here.
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Pakistan is one of three countries alongwith Nigeria and Afghanistan where polio is still endemic.
Most of the recent polio cases have been reported from the violence-hit FATA region where Pakistani army is engaged in the counter-insurgency military operation to flush out foreign and local militants hiding in these rugged mountains, affecting the polio immunisation drive of health workers.
Two security personnels, one each from Karachi and Peshawar, were killed in attacks on polio vaccination teams earlier this month while in March, 12 paramilitary troops and a child were killed in two blasts targeting the health workers.