Abstract | OBJECTIVE: DESIGN: ANIMALS: PROCEDURE: Hamsters and swine were inoculated with L interrogans serovar pomona. Antimicrobial agents were given to hamsters for 3 or 5 days after inoculation, with necropsy at 14 days after inoculation. Swine were treated for 1, 3, or 5 days beginning at 3 weeks after inoculation, and were necropsied 7 to 10 days after completion of antimicrobial agent treatment. Hamster tissue and swine tissue and urine specimens were examined by culture, fluorescent antibody testing, and histologic examination for presence of leptospires. RESULTS: All untreated control hamsters became infected and manifested clinical signs and lesions of acute leptospirosis. Leptospires were not detected in hamsters treated with dihydrostreptomycin/ penicillin G (25 mg/kg of body weight). Administration of ampicillin at all dosages reduced the number of hamsters infected, as confirmed at necropsy; the other agents tested required dosages greater than label recommendations to reduce the number infected. All untreated control swine became infected and shed leptospires in urine through the time of necropsy. Leptospires were not detected in kidneys or urine of swine treated with dihydrostreptomycin/ penicillin G (25 mg/kg) for 1, 3, or 5 days, or in swine treated with oxytetracycline (40 mg/kg for 3 or 5 days), tylosin (44 mg/kg for 5 days), or erythromycin (25 mg/kg for 5 days). Treatment with ceftiofur and ampicillin was not effective in elimination of L interrogans serovar pomona in swine. CONCLUSIONS: CLINICAL RELEVANCE: Use of antimicrobial agents at extra-label dosages for treatment of persistent leptospirosis may cause residue problems in food animals; however, these regimens may be useful for treatment of breeding stock or animals destined for import/export.
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Authors | D P Alt, C A Bolin |
Journal | American journal of veterinary research
(Am J Vet Res)
Vol. 57
Issue 1
Pg. 59-62
(Jan 1996)
ISSN: 0002-9645 [Print] United States |
PMID | 8720239
(Publication Type: Clinical Trial, Comparative Study, Journal Article, Randomized Controlled Trial)
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Chemical References |
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Topics |
- Animals
- Anti-Bacterial Agents
(pharmacology)
- Cricetinae
- Female
- Kidney
(microbiology, pathology)
- Leptospira interrogans
(classification, isolation & purification)
- Mesocricetus
- Species Specificity
- Swine
- Swine Diseases
- Weil Disease
(drug therapy, pathology, veterinary)
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