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  • Title: The virulence variability of different Acinetobacter baumannii strains in experimental pneumonia.
    Author: Eveillard M, Soltner C, Kempf M, Saint-André JP, Lemarié C, Randrianarivelo C, Seifert H, Wolff M, Joly-Guillou ML.
    Journal: J Infect; 2010 Feb; 60(2):154-61. PubMed ID: 19748521.
    Abstract:
    OBJECTIVES: Our objective was to compare the virulence of 5 strains of Acinetobacter baumannii by using a mouse model of pneumonia. METHODS: Six-week old female C3H/HeN mice were used. The pneumonia was inducted by intra-tracheal inoculation of 5.10(6) bacteria. Spontaneous outcome was evaluated by mortality, mice weight variations, and a clinical score. Bacterial counts in lungs, spleen and blood, and inflammatory response in lungs (dosages of tumor necrosis factor-alpha and macrophage inflammatory protein-2) were also measured. Lastly, a histological examination of lungs was performed for 3 strains, giving a histological score. RESULTS: Global mortality varied from 13% to 79% (P<10(-4)). Bacterial counts in lungs within the 4 days following inoculation varied significantly according to different strains. The evolution curves of bacterial counts were also different. There was a significant correlation between the clinical score and mortality (P<0.05) but not between bacterial counts in lungs and mortality. The increase of pro-inflammatory mediator production in lungs and the histological score also varied according to strains. CONCLUSIONS: These results demonstrate the variability of the virulence between strains, and suggest that bacterial proliferation is not the only virulence factor responsible for the pathogenesis in A. baumannii pneumonia.
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