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491,000 Children Paralyzed Over 17 Years, Indian Polio Vaccine Program Study Suggests

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The WHO declared India “polio free” in May 2014, so why are close to half a million young Indians experiencing polio-like paralysis?

A new study titled Correlation between Non-Polio Acute Flaccid Paralysis Rates with Pulse Polio Frequency in India has recently been published in the Journal of Environmental Research and Public Health. Using data obtained from the National Polio Surveillance Programme (NPSP) as reported by the Government of India, the findings corroborate well over a decade of research showing a strong link between rates of non-polio acute flaccid paralysis (NPAFP) and India’s oral polio vaccine (OPV) campaign. The incidence of polio acute flaccid paralysis (AFP) in India has decreased. However, the NPAFP rate has increased since 2000.

In 2005 there was a sharp increase, more than doubling, in India’s national NPAFP rate which coincided with the introduction of a high-potency monovalent vaccine. The new vaccine contained five times the number of Type 1 viruses compared to the previously used one. Pulse polio immunization refers to periodically vaccinating all children under the age of five years against the polio virus. The study’s authors previously showed in 2012 that the subsequent ‘pulses’ sharply increased the rate of NPAFP when more than six rounds of pulse polio are used in the year.

In the recent study, NPAFP rates in Indian states from 2000 to 2017 were examined and again found a high correlation between the number of pulse polio rounds conducted and the NPAFP rate in the state. The researchers state:

“For each round of pulse polio there was an increase of 1.4 cases of NPAFP per under-15 population of 100,000. The highest NPAFP rates were seen in Uttar Pradesh and Bihar, where there was an increase of 2.7 cases of NPAFP per under-15 population of 100,000 for each round of pulse polio.”

India has been considered ‘polio-free’ for over 6 years. In the absence of wild polio transmission, it was expected that the AFP rate would reduce to around 2/100,000 however that has not happened. The exaggerated NPAFP rates of anywhere between 6.43/100,000 to 35/100,000 found in the new study fall well above the expected rate of 2/100,000.

A total of 640,000 children developed NPAFP in the years 2000–2017, suggesting that there were an additional 491,000 paralyzed children above expected numbers for children with NPAFP according to the new study. The authors state:  “…our findings suggest that the increase in NPAFP (and the later decrease in such cases) was indeed an adverse effect of the pulse polio immunization programme.”

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