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Acutely affected animals:
 
Acutely affected animals:
 
Affects a group of calves. Respiratory signs are present and the animals are dull. To establish the cause nasopharangeal swabs or broncho-alveolar lavage can be undertaken and examined for bacteria, viruses or mycoplasma.
 
Affects a group of calves. Respiratory signs are present and the animals are dull. To establish the cause nasopharangeal swabs or broncho-alveolar lavage can be undertaken and examined for bacteria, viruses or mycoplasma.
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Fluorescent antibody tests can be used to detect viral causes.
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Paired serum samples will also show recent exposure to a viral pathogen.
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Post mortem exam can confirm the presence of certain pathogens.
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Chronically affected animals:
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Usually affects  number of animals who are kept indoors. and a number of animals will be
 
==History and Clinical signs==
 
==History and Clinical signs==
 
Causes unthriftiness in animals < 6 months old
 
Causes unthriftiness in animals < 6 months old
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