Co-detection of pandemic (H1N1) 2009 virus and other respiratory pathogens.

From May through October 2009, a total of 10,624 clinical samples from 23 US states were screened for multiple respiratory pathogen gene targets. Of 3,110 (29.3%) samples positive for pandemic (H1N1) 2009 virus, 28% contained ≥ 1 other pathogen, most commonly Staphylococcus aureus (14.