The rates of detection of bacteria from the milk of the cows clinically infected with gangrenous mastitis and examined in this experiment are as follows:
Escherichia coli, 50.9%;
Pseudomonas aeruginosa, 17.0%;
Klebsiella pneumoniae,
Enterobacter aerogenes,
Clostridium perfringens,
Bacillus cereus,
Staphylococcus aureus, and
Streptococcus sp., 4.6% each;
Alcaligenes faecalis,
Acinetobacter anitratus, and
Corynebacterium pyogenes, 1.5% each.
These bacteria were isolated from the affected udders and some mammary lymph nodes, but from few important organs. When the
E. coli isolates were classified into serotypes, 5 strains belonged to O
2, 2 strains each to O
8, O
75, and O
88, and 1 strain each to O
9, 0
64 O
76, and O
89. When the
P. aeruginosa isolates were examined in the same manner, 2 strains each belonged to types E, F, and I and 1 strain each to types A, B, and G. The
E. coli strains were sensitive to CL, CP, CTC, FM, KM, OTC, and SM, and the
P. aeruginosa strains relatively sensitive to CL and SM.
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