South Asia is polio-free:World Health Organization

are 11 polio-free countries. 2011 polio cases had been diagnosed with an incident last January in the Indian state of West Bengal. WHO said in a statement today, all the countries in the region about the polio surveillance and the collection of samples from the fact that India is conducted on a regular basis. The polio vaccine is sufficient to prevent the virus being effective and productive, and early samples from the society in order to detect the disease does not spread easily. Rarely fails polio vaccine effectiveness.