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Median duration of excretion of infectious virus from cloacae after experimental infection of black-headed gulls with one or more inoculations of LPAIV H13N2, LPAIV H16N3, or both, based on virus isolation. The median duration of excretion of infectious virus is based on data for all birds in the group. Gray boxes indicate H13, and white boxes indicate H16.a, the second inoculation of groups 5 and 7 was unsuccessful.
