Influenza C

Influenza C viruses infect both humans and pigs, but do not infect birds.[4] Transmission between pigs and humans have occurred in the past.[5] For example, influenza C caused small outbreaks of a mild form of influenza amongst children in Japan[6] and California Due to its limited host range and the lack of genetic diversity in influenza C, this form of influenza does not cause pandemics in humans.