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Pathog Dis. 2015 Feb;73(1):1-12. doi: 10.1111/2049-632X.12212. Epub 2015 Jan 30.

Evaluation of antimicrobial treatment in a bovine model of acute Chlamydia psittaci infection: tetracycline versus tetracycline plus rifampicin.

Author information

1
Institute of Molecular Pathogenesis at Friedrich-Loeffler-Institut (Federal Research Institute for Animal Health), Jena, Germany.
2
Institute of Bacteriology and Mycology, Veterinary Faculty at The University of Leipzig, Leipzig, Jena, Germany.
3
LIPIDOMIX GmbH, Berlin, Germany.
4
Institute of Molecular Pathogenesis at Friedrich-Loeffler-Institut (Federal Research Institute for Animal Health), Jena, Germany OIE Reference Laboratory for Chlamydiosis at Friedrich-Loeffler-Institut (Federal Research Institute for Animal Health), Jena, Germany.
5
Institute of Molecular Pathogenesis at Friedrich-Loeffler-Institut (Federal Research Institute for Animal Health), Jena, Germany petra.reinhold@fli.bund.de.

Abstract

Antimicrobial treatment of chlamydial infections is known to be of limited efficacy. In this study, effects of doxycycline (D), usually the drug of choice, were compared with the combined therapy of doxycycline and rifampicin (R) in a bovine model of respiratory Chlamydia psittaci infection. After intrabronchial inoculation of the pathogen, 30 animals were assigned to five groups (n = 6 per group): untreated controls, monotherapy with D (5 mg kg(-1)day(-1) or 10 mg kg(-1)day(-1)), and combination therapy of D and R (600 mg day(-1)). Treatment continued until day 14 post inoculation (d.p.i.). Clinical signs, inflammatory markers, and pathological findings confirmed successful infection in all animals. Reisolation of the pathogen was possible in 4/6 untreated animals and in 4/12 animals treated with D alone until 4 d.p.i., but in none of the calves of the two D + R groups. Pathogen detection was possible in all animals without significant differences among groups. Severity of disease and time course of its resolution, assessed by clinical and pathological findings as well as inflammatory parameters, were not significantly different between untreated controls and calves receiving D alone or in combination with R. Regardless of the treatment regimen, all groups recovered clinically and cleared the infection within 2 weeks.

KEYWORDS:

Chlamydia psittaci; antimicrobial treatment; bovine model of respiratory infection; doxycycline; rifampicin; tetracycline

PMID:
25113145
DOI:
10.1111/2049-632X.12212
[Indexed for MEDLINE]

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