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. 2009 Mar 15;199(6):858–865. doi: 10.1086/597073

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© 2009 by the Infectious Diseases Society of America

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Inefficiency of transmission of influenza A/Panama/2007/1999 (Pan99) virus via fomites in Hartley and strain 13 guinea pigs. Arrows indicate the time point for each experiment when intranasally inoculated animals were removed from the cages and replaced with naive guinea pigs. White circles represent nasal wash viral titers for inoculated animals on day 2 after inoculation, and black triangles represent nasal wash viral titers for exposed animals on days 3, 5, 7, and 9 after inoculation. In panel A, 8 Hartley guinea pigs were intranasally inoculated with Pan99 and then replaced with 8 uninfected Hartley guinea pigs (^a7 of 8 exposed animals did not become infected). In panel B, the experiment was repeated using 4 inoculated and 4 exposed Hartley guinea pigs (^b3 of 4 exposed animals did not become infected). In panel C, the same experimental approach was used with 4 Pan99-inoculated and 4 exposed strain 13 guinea pigs (^c3 of 4 exposed animals did not become infected)