The aerobic bacterial flora (excluding Mycoplasma spp.) of the vagina of sixty‐two clinically normal bitches was determined and the species most frequently isolated, in decreasing order, were: Escherichia colt, Streptococcus ‘viridans’, Staphylococcus aureus and Streptococcus cards. From the vaginal exudates of seventy‐two bitches with vaginitis, the order of frequency was: E. coli, Strep, canis and Staph. aureus. The only consistent difference between the bacterial flora from the two sources was the relatively higher numbers of bacteria in the vaginal exudates.

Calves were fed Escbericbia coli of bovine origin containing an R factor with resistance determinants found rarely in human and bovine populations. Some of these calves received tetracycline. Fecal samples from human subjects in daily contact with the calves were analyzed for the R factor, the bovine E. coli, and changes in the levels of tetracycline resistant coliforms. Crossover from the calves to the human subjects of the bovine E. coil was shown to occur but was unrelated to whether or not the calves were receiving tetracycline. The levels of tetracycline resistant coliforms in the feces of the human subjects were not influenced by contact with the calves or tetracycline. (

One hundred and eighteen isolates of Pseudomonas aeruginosa obtained from clinical material were tested for susceptibility to antimicrobial agents. Regardless of species of animal from which the isolate was obtained, 75% of the isolates were inhibited by ≤ 4 μg of gentamicin/ml, 100% by ≤ 4 μg of tobramycin/ml, 97% by ≤ 128 μg of carbenicillin/ml, and 2% by ≤ 64 μg of chloramphenicol/ml.