Fig. 4: Airborne transmissible influenza A viruses infected the human respiratory epithelium.
From: Influenza A viruses are transmitted via the air from the nasal respiratory epithelium of ferrets

Representative pictures of primary cultures of human nasal respiratory epithelium (MucilairTM) inoculated with A/H1N1, A/H3N2, A/H5N1AT, A/H5N1 viruses or PBS (Mock). Influenza A virus nucleoprotein expression was determined by immunohistochemistry (IHC) and is shown as a red stain. Scale bar 100 μm.