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During the acute, vesicular stage of the disease
animals will be pyrexic with temperatures up to 41°C. Pyrexia
usually declines after about the second day of overt clinical
signs. In pigs, several animals in the herd are usually observed
to be dull, depressed and anorexic.
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In dairy cows a dramatic drop in milk yield often
precedes other signs. This can be followed by secondary mastitis
and a permanent loss in milk yield in animals allowed to recover.
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Starts serous and becomes mucopurulent as the disease
progresses.
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Check the following sites:
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mouth, including gingiva, gums, tongue, buccal
cavity and nares
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feet including coronary band, interdigital
space, bulbs of heel, accessory digits and pressure points
of the limb (particularly in pigs)
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mammary glands.
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Feet are frequently hot and painful on palpation
even before vesicles have formed. Several animals in the herd
or flock are frequently affected at the same time.
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In young animals due to a peracute myocarditis -
'tiger striping'. Death of young stock can precede the onset of
clincial signs in nearby adult animals which are incubating the
disease due to the speed of development of myocarditis in young
animals.
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