A recent alarm warning against complacency in polio vaccination has come from an unlikely place: Canada.
Infectious poliomyelitis, eradicated in much of the world during the past 2 decades, remains endemic only in Nigeria, India, Afghanistan, and Pakistan. But a new outbreak last spring in Tajikistan has resulted in 452 laboratory-confirmed cases of wild poliovirus type 1 and 20 deaths. At least 7 related cases have been reported in the Russian Federation.
Voelker R. Have Polio-Free Countries Lost Sight of Need to Keep Vaccination Rates High?. JAMA. 2010;304(10):1056. doi:10.1001/jama.2010.1288