ISLAMABAD, May 9 (Xinhua) -- Four environmental samples in Pakistan have tested positive for wild poliovirus type 1 (WPV1), the country's National Institute of Health (NIH) said on Thursday.
The virus has been detected in sewage samples taken from three cities in the country, raising the tally of this year's environmental samples to 116, the regional reference laboratory for polio eradication at the NIH said in a statement.
Uh-oh! Daily quota reached.
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