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Pathological examination of the respiratory epithelia (left) and olfactory epithelia (right) of the nasal turbinates of infected 4-week-old hamsters. The images show the nasal turbinates of hamsters on day 3 postinfection with 106 PFU of H3N2/2013 (A), pdmH1N1/2013 (B), or Victoria/2014 (C) virus. HE, hematoxylin and eosin staining; IHC, immunohistochemistry for the detection of influenza virus NP antigen.
