black spot

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black spot

1. lesions on the teats of cows and almost always confined to the tip and including the orifice of the teat sinus. They are deep ulcers containing granulation tissue and usually a black spot. Milk flow is impeded and the lesion is very painful. They are caused by excessive suction during milking although Staphylococcus aureus is usually recoverable from the lesions. Called also black pox.
2. a fungal infection of chilled beef caused by Cladosporium herbarum and characterized by black spots on the surface of the meat.