Merck Manual

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Vaginal cytology, other cell types
Vaginal cytology, other cell types

In addition to epithelial cells, RBCs are seen mostly during proestrus. Abrupt appearance of neutrophils on vaginal cytology indicates the first day of diestrus. A large number of neutrophils along with presence of bacteria in a bitch may indicate vaginitis.

Courtesy of Dr. Mushtaq Memon.