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Bacteriologic Exmanination of Guinea Pig Mammary Gland: Preliminary Report¹

College of Veterinary Medicine, Michigan State University, East Lansing 48823

ABSTRACT

Tissues from 398 mammary glands of 199 apparently healthy guinea pigs were examined baeteriologically. Mammary tissues were collected from primiparous and multiparous guinea pigs at different stages of lactation. Bacteria (-hemolytic Streptococcus, ß-hemolytic Streptococcus, and Micrococcus spp.) were isolated from 6.8% of the mammary tissue cultured (5.9% from the primiparous, and 13.0% from the multiparous guinea pigs). During the first week of lactation, the percentage of infected mammary tissues was 5.6%, while during the second week it was 2.9%.

¹ This investigation was supported, in part, by Michigan Agricultural Experiment Station Project 3058, Journal Article 5227.

⁷ Present mailing address: National Institute of Environmental Health Sciences, NIH, P.O. Box 12233, Besearch Triangle Park, North Carolina 27709.