A REPORT in this newspaper on Thursday says five fresh polio cases have been detected in Balochistan, bringing the number of children affected by the virus in Pakistan this year to over 100. Balochistan leads this unfortunate count with nearly 50 cases. Another alarming development is that a boy in Karachi's Gadap Town, who reportedly received anti-polio drops seven times, is among the recent victims. It is worrisome that there are increasing reports of children in different parts of the country contracting polio despite receiving numerous doses of the vaccine. This raises questions about the efficacy of the polio vaccine; perhaps there are issues with the way it is being stored and handled. Reports that the virus has been detec-ted in Multan, Lahore and Rawalpindi are also cause for concern.

The state's health authorities as well as international experts need to investigate why there have been cases of infection despite the vaccine being administered multiple times. If the vaccine's efficacy has been compromised, the problem must be rectified immediately. The state also needs to monitor migrant and mobile populations who play a major role in transmitting the virus from high-risk to hitherto 'clean' zones. For example, the highest number of polio cases was reported from Balochistan's Qilla Abdullah district which borders Afghanistan. Pakistan and Afghanistan — both endemic countries — re-infect each other due to the regular movement of people between them. The World Health Organisation has recommended that mobile and migrant populations be mapped in order to keep track of polio's spread. The state needs to implement this recommendation to the fullest and plug the loopholes. Failure to do so will have consequences apart from the health risk: the World Bank has warned that a $40m grant will be converted into a loan due to Pakistan's poor response to the fight against polio.