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  • Title: [Characterization of strains of Escherichia coli isolated from calves with neonatal diarrhea].
    Author: Campero C, Odeon A, Binsztein N, Smith J, Cipolla A.
    Journal: Rev Argent Microbiol; 1985; 17(4):203-8. PubMed ID: 3916646.
    Abstract:
    Thirty fecal samples of diarrheic calves from a beef herd with previous history of neonatal diarrhea were cultured for isolation of Escherichia coli K99 (+) and for enterotoxigenic tests. The age distribution of sampled calves was: 1 animal less than 6 days old, 21 between 7-15 days old and 8 between 16-30 days old. Although most strains were classified as Isaacson et al (16) biotype four, they were negative for detection of K99 antigen by slide agglutination test. The assay for heat-stable (ST) and heat-labile (LT) enterotoxins by intragastric infant mouse inoculation and ELISA tests, respectively, were negative. More than 93% of the E. coli strains were sensitive to ampicillin, colistin, gentamycin and nitrofurantoin .
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