The story so far: A two-year-old child in Tikrikilla, Meghalaya has been infected with vaccine-derived polio. Vaccine-derived polio is a rare condition that occurs when the weakened strain of poliovirus used in the oral polio vaccine mutates and regains the ability to cause paralysis. More about polio vaccines The first successful polio vaccine for poliovirus was made by Jonas Salk, …
Not wild poliovirus but vaccine-derived poliovirus was detected in the environmental surveillance of sewage samples from Kolkata, said a senior Health Ministry official on Thursday. A VDPV is a strain of the weakened poliovirus that was initially included in OPV and that has changed over time and behaves more like the wild or naturally occurring virus. Of the three strains …
