There is some evidence of occasional infections of dogs with influenza viruses, and accompanying signs of respiratory disease. However, there is no good evidence that dogs can infect humans or serve as reservoir hosts for the virus. Mycoplasmas are commonly found in both diseased and healthy dogs: their main importance is probably as secondary invaders once the respiratory mucosa has been damaged by other, primary agents. However, there is some experimental evidence that M. cynos could induce lesions in 1-week-old pups.

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