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==Signalment==
==Signalment==
Mainly a problem in calves less than 6 months old and particularly affects 2-10 week old animals. It occurs more commonly in dairy calves than beef calves.
Mainly a problem in calves less than 6 months old and particularly affects 2-10 week old animals. It occurs more commonly in dairy calves than beef calves.
==Diagnosis==
==Diagnosis==
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.
==History and Clinical signs==
==History and Clinical signs==
Causes unthriftiness in animals < 6 months old
Causes unthriftiness in animals < 6 months old