Table 2. Viral plaque assay results for cough-generated aerosols.

Aerosol sampler	Total # of subjects for whom VPA was performed on cough aerosol	Total # of these subjects who were influenza-positive (by qPCR or VPA)	# of influenza-positive nasal swabs		# of influenza-positive cough aerosols
			qPCR	VPA	qPCR	VPA
NIOSH two-stage sampler	20	12	9 (of 18)	7	8	1
SKC BioSampler	10	9	9	4	6	1

Nasopharyngeal swabs and cough aerosol samples from 30 subjects were cultured for viable influenza virus. This table shows the number of samples found to be influenza-positive by qPCR and VPA.