Summary curves of viral shedding in experimental influenza virus infection, according to the virus type or subtype. Summary curves of viral shedding in experimental influenza virus infection, according to the virus type or subtype. Eight curves (116 participants who shed influenza virus) for A/H1N1 subtype (21, 22, 24, 26, 32, 74–76) and four curves (41 participants) for A/H3N2 subtype (25, 28, 40, 45) were averaged, and one curve (eight participants) was plotted for the B type (24). Bold curves correspond to weighted averages of study curves (standard error). Fabrice Carrat et al. Am. J. Epidemiol. 2008;167:775-785 American Journal of Epidemiology © 2008 The Authors