Quote:
Originally Posted by TheWiseShopper
How did this one case occur if polio was eradicated??
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It has not been
eradicated. It is still endemic in Pakistan and Afghanistan. It has been
eliminated in the US; it is no longer endemic here.
Cases continue to be spread from those two countries.
The vaccine used in the polio eradication campaigns uses a live attenuated virus with the potential to mutate to a form that can cause polio disease. It is used because it is cheap and easier to administer than an injection. Since it spreads to unvaccinated people it provides broader community protection. Ideally, the injection would be used worldwide, eliminating vaccine derived polio cases, and that is a goal.
https://www.who.int/news/item/24-06-...ency-committee
The US case is vaccine derived, not wild virus. The individual is not vaccinated. The virus would have been acquired from contact with someone who had taken the oral vaccine. Since the US does not use the oral vaccine, the case is considered imported from somewhere that does.
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