Polio cases derived from new oral vaccine reported for first time

Experts have long understood that a new polio vaccine developed to try to minimize the risks associated with the oral polio vaccine made by Albert Sabin might also cause the…

Mar 19, 2023 - 15:23
Polio cases derived from new oral vaccine reported for first time

Experts have long understood that a new polio vaccine developed to try to minimize the risks associated with the oral polio vaccine made by Albert Sabin might also cause the problem it was created to sidestep. It’s now clear that theoretical risk is a real one.

The Global Polio Eradication Initiative announced Thursday that six children in the Democratic Republic of the Congo and one in Burundi have been paralyzed by viruses from the new vaccine, which is referred to as novel oral polio vaccine, or nOPV2. (The “2” signals the vaccine targets type 2 polioviruses.) In addition, five environmental samples collected from Burundi contained the so-called type 2 circulating vaccine-derived polioviruses, or cVDPV2s.

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