A genetically stable attenuated poliovirus vaccine
Eradication of poliomyelitis appears to be on track: types 2 and 3 polioviruses have been declared eradicated, and in the past 12 months there have been just 338 cases of type 1 polio in Afghanistan and Pakistan. But there have also been 491 cases of polio caused by the type 2 Sabin vaccine. The development …
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