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Binding of influenza viruses to human respiratory tissue sections. Human tracheal and alveolar tissue sections were incubated with clade 2.3.4 viruses (AH05, JS08, JL09, and LN09), clade 2.3.2 viruses (HB07, TJ09, and GD09), clade 7 viruses (SY08, SX09, and NX09), pandemic H1N1 (CA04) influenza virus, or negative control. Influenza virus nucleoprotein was subsequently localized by fluorescein isothiocyanate-labeled goat anti-mouse IgG.
