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Rates of recovery of influenza virus. The rates of recovery of infectious influenza virus using the viable cascade impactor were assessed by spiking the collection medium on impactor plates with virus (101 to 105 PFU) and then passing sterile air through the impactor for 30 or 5 min. Virus titers in collection medium were determined by plaque assay without dilution and compared to the amount used to spike the plate. The mean percentage (+SD) of recovery for each virus is shown.
