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NPTr cells infected by SIV H1N1 and PRCoV. Viral nucleoprotein of SIV H1N1 (green, A) or PRCoV (red, B), compared to uninfected control (C) was stained by monoclonal antibodies 3 d p.i.. Co-infection: PRCoV + SIV H1N1 (D), 1.PRCoV + 2.SIV H1N1 (E), 1.SIV H1N1 + 2.PRCoV (F). Nuclei were stained by DAPI (blue). (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)
