Canine influenza virus (CIV) is highly infectious.

Modes of transmission and timing of viral shedding and clinical signs contribute to the highly contagious nature of CIV.

Incubation Period

The incubation period, or time from clinical exposure to the onset of clinical signs, is approximately 2 to 4 days for CIV.² This is a relatively short incubation period that is similar to that of influenza infection in other species. However, it is shorter compared to other causes of acute respiratory disease in canines, such as canine distemper and Bordetella bronchiseptica.²