Experimental infection of Swiss Webster mice with four rat bartonella strains: Host specificity, bacteremia kinetics, dose dependent response, and histopathology

• Published in: Comparative immunology, microbiology and infectious diseases Vol. 34; no. 6; pp. 465 - 473
• Main Authors: Colton, Leah, Zeidner, Nordin, Kosoy, Michael Y
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.12.2011; Elsevier
• Subjects: Allergy and Immunology; Animals; Bacteremia; Bacteremia - microbiology; Bacterial diseases; Bacterial sepsis; Bacteriology; Bartonella; Bartonella - classification; Bartonella - genetics; Bartonella coopersplainensis; Bartonella Infections - microbiology; Bartonella Infections - pathology; Biological and medical sciences; Disease Models, Animal; Dose response; Female; Fundamental and applied biological sciences. Psychology; Genes, Bacterial; Granuloma - pathology; Histopathology; Host Specificity; Human bacterial diseases; Infectious Disease; Infectious diseases; Kidney - pathology; Kinetics; Liver - pathology; Medical sciences; Mice; Microbiology; Miscellaneous; Mouse model; Phylogeny; Rat; Rats; Rattus; Bartonella; Histopathology; Rat; Bartonella coopersplainensis; Rattus; Host specificity; Mouse model; Dose response; Bacteremia; Animal model; Rodentia; Strain specificity; Infection; Vertebrata; Experimental disease; Mammalia; Immunology; Mouse; Bacteriosis; Bacteria; Bartonellaceae; Kinetics
• ISSN: 0147-9571; 1878-1667
• DOI: 10.1016/j.cimid.2011.08.001

Abstract Groups of Swiss Webster outbred mice were each inoculated with one of four bartonella strains originally isolated from Rattus spp. at doses ranging from 101 to 107 bacteria per mouse. One strain, Rn1691yn ( Bartonella coopersplainensis -like), infected mice and produced bacteremias at levels up to 105 bacteria/ml of blood and from 3 to 8 weeks duration. A dose dependent response was also observed with differing proportions of mice bacteremic following inoculation at different doses. In addition weeks-to-months long lags in bacteremia manifestation occurred following lower dose exposures. The possibility of bacterial transmission from bacteremic mice to uninfected cagemates was assessed and no naïve mice became infected from contacts with infected mice. Finally, a subset of bacteremic mice inoculated with high doses of Rn1691yn were examined histopathologically and multifocal, granulomatous lesions were detected in both liver and kidneys. The host specificity and infectivity of the strains is discussed in relation to their potential for zoonotic transmission to incidental hosts.