ISLAMABAD
National Institute of Health (NIH) said on Wednesday that four new environmental samples had tested positive for wild poliovirus type 1 (WPV1), bringing the total number of positive samples this year to 112.
ISLAMABAD
National Institute of Health (NIH) said on Wednesday that four new environmental samples had tested positive for wild poliovirus type 1 (WPV1), bringing the total number of positive samples this year to 112.
