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. 2011 Dec 29;7(12):e1002443. doi: 10.1371/journal.ppat.1002443

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Q-PCR for influenza A M gene on RNA extracted from the filter of the cyclone-based air samplers. Air was collected for one hour on the outside of the infected ferret cage, each bar represents the amount of particles released by a single ferret infected with Rec pH1N1 (A), Eurasian (B), TRS (C), or 6∶2 reassortant (D). Absolute RNA was quantitated using a standard curve of in vitro transcribed influenza M gene RNA. Inf stands for infected ferret.