Polio eradication is an uncompromising goal. The virus must disappear from every part of the world and stay gone, as new signs of the virus in a single country can derail the effort. In polio’s case, there were several ominous setbacks
Polio eradication is an uncompromising goal. The virus must disappear from every part of the world and stay gone, as new signs of the virus in a single country can derail the effort. In polio’s case, there were several ominous setbacks
हिन्दी 
English