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Oropharyngeal infection is followed by '''viremia'''. Subsequently there are 2 distinct syndromes:
Oropharyngeal infection is followed by '''viremia'''. Subsequently there are 2 distinct syndromes:
#'''Myocarditis''' in puppies aged 3-8 weeks - the virus targets rapidly dividing myocardium leading to sudden death, or '''fading puppy''' syndrome. This is now rare due to widespread passive immunity.
#'''Myocarditis''' in puppies aged 3-8 weeks - the virus targets rapidly dividing myocardium leading to sudden death, or '''fading puppy''' syndrome. This is now rare due to widespread passive immunity.
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#'''Enteritis''' in puppies >6 weeks of age. The virus targets intestinal crypts, causing the villi to shorten and the destruction of cypt cells, leading to gray, persistent, foul-smelling diarrhoea or hemorrhagic enteritis. CPV has a high morbidity but low mortality (10%) rate.
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#'''Enteritis''' in puppies >6 weeks of age. The virus targets intestinal crypts, causing the villi to shorten and the destruction of cypt cells, leading to gray, persistent, foul-smelling diarrhoea or [[Gastroenteritis, Haemorrhagic|hemorrhagic enteritis]]. CPV has a high morbidity but low mortality (10%) rate.
==Epidemiology==
==Epidemiology==