The World Health Organization (WHO) has declared the recent spread of polio virus a public health emergency. Incidence of polio have seen a marked increase in Afghanistan, Cameroon, Equatorial Guinea, Ethiopia, Israel, Nigeria, Pakistan, Somalia and Syrian Arab Republic. These countries are cooperating with WHO to implement an International Certification of Vaccination Prophylaxis — a proof of vaccination for people travelling from these countries.
Government of Canada recommends that travellers to these countries “should be advised to seriously consider delaying travel to areas where polio is endemic or outbreaks are occurring, ideally until full immunization has been obtained or until at least two doses of IPV have been received (90% seroprotection; see Immunogenicity and safety of vaccine)”.
See Vaccination Recommendations for Canadian Travellers (scroll down the page).