Detection and Isolation of Airborne Influenza A H3N2 Virus Using a Sioutas Personal Cascade Impactor Sampler

Table 3

Approximate viral count in concentrated SKC BioSampler and PCIS collection media.

		Approximate no. of viable virions^a
		Site 1	Site 2	Site 3
SKC BioSampler		~2,500	~130	~1,200
PCIS
Filter position	Cut-off size
Stage A	>2.5 𝜇m	~60	—	—
Stage B	1.0–2.5 𝜇m	—	—	—
Stage C	0.5–1.0 𝜇m	~50	~30	~20
Stage D	0.25–0.5 𝜇m	~390	~70	~180
After-filter	<0.25 𝜇m	~130	—	~110

aApproximate (total) number of viable virions in 500 𝜇L of concentrated collection media (from 0.375 m³ of sampled air).