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Enzootic Pneumonia - Calves (view source)

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==History and Clinical signs==

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*Causes unthriftiness in animals < 6 months old

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Causes unthriftiness in animals < 6 months old

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*Usually the primary pathogen is a virus, secondary pathogens are bacteria and mycoplasmas

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*Pathogens:

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All transmitted by aerosol and direct contact

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**[[:Category:Mycoplasmas|''Mycoplasmas'']]

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***Mycoplasmal [[Bronchi and Bronchioles Inflammatory - Pathology#Infectious causes of bronchitis or bronchiolitis|bronchitis]] and [[Lungs Inflammatory - Pathology#Infectious causes of pneumonia|pneumonia]] of calves is an important component of the syndrome of enzootic pneumonia

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***On its own causes Mycoplasmal ("Cuffing") pneumonia responsible for [[Bronchi and Bronchioles Inflammatory - Pathology#Infectious causes of bronchitis or bronchiolitis|bronchitis and bronchiolitis]] and [[Lungs Inflammatory - Pathology#Infectious causes of pneumonia|bronchointerstitial pneumonia]]

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***It is thought to pick up host antigens in order to prevent recognition by the body defences as foreign

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***In uncomplicated mycoplasma infection, the lesions are generally mild and consist of patchy red/purple areas of [[Lungs Ventilation - Pathology#Atelectasis|atelectasis]] in the '''cranio-ventral lung lobes'''

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***More confluent areas can develop with an underlying bronchointestitial pneumonia and resulting atelectasis

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***''M. bovis''

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****Most pathogenic

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****Widespread lymphofollicular accumulations which contain germinal centres develop more slowly

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****These lesions can result in narrowing of the bronchiolar lumina - this is the classical lesion of '''‘cuffing pneumonia’'''

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***''M. dispar''

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***''Ureaplasma'' sp.

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**Viruses

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*All transmitted by aerosol and direct contact

==Pathology==

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Enzootic Pneumonia - Calves (view source)

Revision as of 16:51, 27 July 2010

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