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Viral replication of influenza A/California/07/2009 and A/Brisbane/59 in ferrets following intranasal challenge. (A) Nasal wash, (B) trachea and (C) lungs were collected from ferrets at indicated days post-infection and titered on MDCK cells (TCID50). Hematoxylin and eosin stained sections from paraffin embedded lung tissue: (D) A/California/07/2009, (E) A/Brisbane/59/2007 and (F) uninfected.
