Proliferation of Pasteurella pneumotropica at oestrus in the vagina of rats.
Using a colony of Wistar-Imamichi rats contaminated with P. pneumotropica, the vaginal microflora was qualitatively and quantitatively investigated by swabbing. P. pneumotropica was the most dominant organism in the majority of rats examined. The population of P. pneumotropica and indigenous bacteria increased significantly higher at oestrus than in other oestrous stages. By the vaginal flushing technique changes in the population of P. pneumotropica and total bacteria, and changes in vaginal cell type and bacterial counts adhering to vaginal epithelial cells were consecutively investigated. The populations of P. pneumotropica and total bacteria were maximal at oestrus. The increase was correlated with an increase in cornified non-nucleated cells, with large numbers of adherent Gram-negative coccobacilli. The findings indicate that the vagina is a suitable site for colonization by P. pneumotropica in adult female rats, and that proliferation of P. pneumotropica may be due to increased affinity of the organism for cornified non-nucleated cells.
D000818:Animals; D000830:Animals, Laboratory; D001419:Bacteria / Q000302:isolation & purification; D004971:Estrus; D005260:Female; D010325:Pasteurella / Q000254:growth & development* / Q000302:isolation & purification; D011247:Pregnancy; D051381:Rats / Q000382:microbiology*; D011919:Rats, Inbred Strains; D013045:Species Specificity; D014621:Vagina / Q000382:microbiology*