Antimicrobial Resistance in Bordetella bronchiseptica

Microbiology Spectrum
Kristina Kadlec, Stefan Schwarz

Abstract

Bordetella bronchiseptica is involved in respiratory tract infections mainly in dogs and pigs but may also cause infections in humans. Valid and representative data on antimicrobial susceptibility of B. bronchiseptica is rare. Approved antimicrobial susceptibility testing methods have been published, but very few clinical breakpoints are available. The MIC values are low for most agents but high for β-lactam antibiotics and macrolides. Information on the genetic basis of resistance is scarce. For a small number of isolates that are resistant or show elevated MICs, the molecular basis of resistance was identified. Three tetracycline resistance genes, tet(A), tet(C), and tet(31), coding for major facilitator superfamily efflux pumps, were identified. Two other major facilitator superfamily exporter genes confer resistance to chloramphenicol (cmlB1) or to chloramphenicol and florfenicol (floR). Two class B chloramphenicol acetyltransferase genes (catB1 and catB3), which confer resistance to nonfluorinated phenicols by enzymatic inactivation, have been identified in B. bronchiseptica. Like the trimethoprim resistance genes dfrA1 and dfrB1, which code for trimethoprim-insensitive dihydrofolate reductases, the genes catB1 and catB3 w...Continue Reading

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