Mycoplasma hyopneumoniae (Mhp) is one of the smallest bacteria found in nature. It infects only pigs, and is endemic across many swine operations, where it has not been intentionally eliminated. Mhp causes respiratory disease, characterized by its chronic nature, high morbidity, low mortality and decreased performance. It also allows other upper-respiratory bacteria to proliferate in the lungs and contribute to disease and poor performance.1
Clinical signs associated with Mhp vary, depending on the presence of secondary infections from other bacteria or viruses. Normal signs of a simple infection include a deep, nonproductive cough, thumping, mild to moderate fever, rough coat, decreased appetite/feed intake and reduction in average daily gain.
Infection and clinical disease normally occur in the finishing phase of production, from 10 to 12 weeks of age to market time. However, the infection can occur at any stage of production. Diagnosis of Mhp is based on clinical signs and diagnostic testing. See the below videos for more information about gathering diagnostic samples.
Biosecurity and vaccination are the primary means for controlling Mhp and mitigating the consequences of infection. In recent years, Mhp elimination has also become possible through advances in inoculation and diagnostic techniques.
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