Merck Manual

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Gram stain of Prototheca in milk smear
gram-stain-prototheca-milk-smear-cow-erskine-high
Gram stain of Prototheca in milk smear

    Gram stain of Prototheca in milk smear. Note the large size of the cells.

Courtesy of Dr. Ronald Erskine.

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Mastitis in Cattle