U.S. polio case tied to viruses detected in U.K., Israel, suggesting silent spread

Genetic analysis of the virus responsible for the first case of polio in the United States in nearly a decade shows it is linked to vaccine-derived viruses recently detected in Jerusalem and London, the Global Polio Eradication Initiative announced on Friday.

“Further investigations — both genetic and epidemiological — are ongoing to determine possible spread of the virus and potential risk associated with these various isolates detected from different locations around the world,” the program said in a statement.

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