Een tweeluik.
Zie ook onderstaand draadje voor meer info.
#Polio
In 2016, global health officials altered the composition of the oral vaccine.
Previously, the vaccine protected against all three types of wild polio. Then they withdrew one of those types — the one that was leading to most of the vaccine-derived cases but whose wild form had
been successfully eradicated.
Vaccine-derived poliovirus of that type was still in circulation from earlier iterations of the oral vaccine — and now with the reformulated vaccine, increasing numbers of people who were no longer vaccinated against it. So there was further spread.
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