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Preliminary evaluation of antimicrobial agents for treatment of Leptospira interrogans serovar pomona infection in hamsters and swine.
Am J Vet Res. 1996 Jan; 57(1):59-62.AJ

Abstract

OBJECTIVE

To evaluate antimicrobial agents for treatment of models of acute and persistent leptospirosis caused by Leptospira interrogans serovar pomona.

DESIGN

Randomized trials comparing dosages and regimens of various antimicrobial agents for treatment of acute and persistent leptospirosis.

ANIMALS

245 Golden hamsters to model acute leptospirosis and 121 mixed-breed swine to model persistent leptospirosis.

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

Dihydrostreptomycin/penicillin G is effective for treatment of acute and persistent leptospirosis. Differences between the effectiveness of antimicrobial agents in the acute and persistent model of leptospirosis emphasize the importance of using the appropriate model for treatment evaluation. Antimicrobial agents evaluated for treatment of persistent leptospirosis in swine required the use of dosages above those recommended by the manufacturer.

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.

Authors+Show Affiliations

National Animal Disease Center, USDA, Ames, IA 50010, USA.No affiliation info available

Pub Type(s)

Clinical Trial
Comparative Study
Journal Article
Randomized Controlled Trial

Language

eng

PubMed ID

8720239

Citation

Alt, D P., and C A. Bolin. "Preliminary Evaluation of Antimicrobial Agents for Treatment of Leptospira Interrogans Serovar Pomona Infection in Hamsters and Swine." American Journal of Veterinary Research, vol. 57, no. 1, 1996, pp. 59-62.
Alt DP, Bolin CA. Preliminary evaluation of antimicrobial agents for treatment of Leptospira interrogans serovar pomona infection in hamsters and swine. Am J Vet Res. 1996;57(1):59-62.
Alt, D. P., & Bolin, C. A. (1996). Preliminary evaluation of antimicrobial agents for treatment of Leptospira interrogans serovar pomona infection in hamsters and swine. American Journal of Veterinary Research, 57(1), 59-62.
Alt DP, Bolin CA. Preliminary Evaluation of Antimicrobial Agents for Treatment of Leptospira Interrogans Serovar Pomona Infection in Hamsters and Swine. Am J Vet Res. 1996;57(1):59-62. PubMed PMID: 8720239.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Preliminary evaluation of antimicrobial agents for treatment of Leptospira interrogans serovar pomona infection in hamsters and swine. AU - Alt,D P, AU - Bolin,C A, PY - 1996/1/1/pubmed PY - 1996/1/1/medline PY - 1996/1/1/entrez SP - 59 EP - 62 JF - American journal of veterinary research JO - Am J Vet Res VL - 57 IS - 1 N2 - OBJECTIVE: To evaluate antimicrobial agents for treatment of models of acute and persistent leptospirosis caused by Leptospira interrogans serovar pomona. DESIGN: Randomized trials comparing dosages and regimens of various antimicrobial agents for treatment of acute and persistent leptospirosis. ANIMALS: 245 Golden hamsters to model acute leptospirosis and 121 mixed-breed swine to model persistent leptospirosis. 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: Dihydrostreptomycin/penicillin G is effective for treatment of acute and persistent leptospirosis. Differences between the effectiveness of antimicrobial agents in the acute and persistent model of leptospirosis emphasize the importance of using the appropriate model for treatment evaluation. Antimicrobial agents evaluated for treatment of persistent leptospirosis in swine required the use of dosages above those recommended by the manufacturer. 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. SN - 0002-9645 UR - https://www.unboundmedicine.com/medline/citation/8720239/Preliminary_evaluation_of_antimicrobial_agents_for_treatment_of_Leptospira_interrogans_serovar_pomona_infection_in_hamsters_and_swine_ L2 - https://medlineplus.gov/antibiotics.html DB - PRIME DP - Unbound Medicine ER -