How Polio Returned to the United States

Image caption: The polio virus has a coat of protein surrounding a RNA genetic material in its core. Image credit: Roger Harris/Science Photo Library via Getty. Article by Robin Fields, ProPublica. Undark – August 2, 2022. This article was originally published by ProPublica. 

Officials are still determining how the virus moved from one location to another and where it first occurred.

About a month ago, British health authorities announced they’d found evidence suggesting local spread of polio in London. It was a jolt, to be sure. The country was declared polio-free in 2003. But at least no one had turned up sick. The proof came from routine tests of sewage samples, which can alert health officials that a virus is circulating and allow them to intervene quickly. Based on genetic analysis […]

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