Sir: According to the World Health Organisation (WHO), 74 cases of wild polio virus have so far been detected this year; 59 of those cases have been reported from Pakistan, of which 46 are from FATA. This means 79 percent of cases were reported in Pakistan of which 77 percent were from FATA, the region where the militants reign supreme. A number of vaccination officials have been killed. WHO has been asking us to take necessary actions to curb polio, but our leadership has failed to come up to its expectations. And now we are faced with travel restrictions. Pakistan has no way but to accept the WHO guidelines. The basic scientific rule is that as long as there is a single infected child, there is a risk to children all over the world. Failure to eradicate polio in any country could result in as many as 200,000 new cases every year, and within 10 years, all over the world. This is the reason behind putting travel restrictions on Pakistanis. Once travel restrictions are brought into practice, every Pakistani will have to have a certificate that he had been vaccinated not later than a month before. I hope the government will make it an integral part of passport and visa documentation. The ultimate goal will be to make Pakistan polio-free. It is our duty to play our part. Saif R K Islamabad