Polio vaccination campaign in Karachi after poliovirus found in samplesA health worker prepares to administer the polio vaccine to children at a rail station in Karachi, Pakistan, 11 September 2023. Four environmental samples collected in August from Karachi and Peshawar have tested positive for the poliovirus. Pakistan's National Polio Laboratory has confirmed the detection of Type-1 Wild Poliovirus (WPV1) in these samples, indicating a risk of transmission in these areas. Polio is a highly infectious and incurable disease that primarily affects children under the age of five.

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