Parainfluenza is caused by a virus which produces a mild respiratory tract infection. It is often associated with other respiratory tract viruses. In combination these viruses are usually transmitted by contact with the nasal secretions of infected dogs. The vaccine to protect against this disease may be combined with other vaccines to offer broader protection. Characteristic clinical signs of CPI Infection is coughing that may be intensified by activity or excitement. Environmental factors such as drafts, colds and high humidity may enhance susceptibility to the disease. Typically, CPI is self-limiting, with a course of 5 to 10 days duration. However, secondary bacterial infection of the respiratory tract are not uncommon, and may complicate the clinical syndrome.

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