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Open Access Susceptibility of Irradiated B6D2F1/J Mice to Klebsiella pneumoniae Administered Intratracheally: A Pulmonary Infection Model in an Immunocompromised Host

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Bacteria such as Klebsiella pneumoniae can invade and colonize an immunocompromised host and complicate clinical recovery. In the study reported here, an experimental model of induced pneumonia was developed in 60Co -photon-irradiated mice for the purpose of evaluating efficacy of therapeutic agents. The model was characterized by use of probit analysis of bacterial dose, and microbiologic, and histopathologic results. Bacterial colony-forming-unit (CFU) values producing 50% mortality within 30 days (LD50/30) and their 95% confidence intervals were 4.0 × 104 [1.7 × 104 - 8.9 × 104] for 0-Gray (Gy)-irradiated mice, 1.9 × 104 [7.0 × 103 - 4.8 × 104] for 5-Gy-irradiated mice, and 1.0 × 103 [2.8 × 102 - 3.3 × 103] for 7-Gy-irradiated mice. Probit regression line fits calculated by use of an iterative, weighted least-squares fit, were used to assess a dose-modifying factor (DMF). The DMFs for mortality, compared with that for the 0-Gy dose, with their 95% confidence intervals, were 2.2 [0.63 - 7.7] for the 5-Gy and 38.9 [9.6 -165.0] for 7-Gy doses. The 5-Gy probit line did not significantly differ (P = 0.21) from the 0-Gy probit line (dose ratios did not significantly differ from 1), whereas the 7-Gy probit line differed significantly from the 0-Gy probit line (P < 0.001). These results demonstrate that 7-Gy 60Co -photon radiation in combination with intratracheal K. pneumoniae challenge induces a valid pulmonary infection model in immunocompromised female B6D2F1/J mice.

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Document Type: Research Article

Affiliations: 1: Center of Laboratory Animal Medicine and Department of Preventive Medicine and Biometrics, Uniformed Services University of the Health Sciences, 4301 Jones Bridge Road, Bethesda, Maryland 20814-4799 2: Radiation Medicine Department, Armed Forces Radiobiology Research Institute, 8901 Wisconsin Avenue, Bethesda, Maryland 20889-5603 3: Veterinary Sciences Department, Armed Forces Radiobiology Research Institute, 8901 Wisconsin Avenue, Bethesda, Maryland 20889-5603

Publication date: 2003-08-01

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  • Comparative Medicine (CM), an international journal of comparative and experimental medicine, is the leading English-language publication in the field and is ranked by the Science Citation Index in the upper third of all scientific journals. The mission of CM is to disseminate high-quality, peer-reviewed information that expands biomedical knowledge and promotes human and animal health through the study of laboratory animal disease, animal models of disease, and basic biologic mechanisms related to disease in people and animals.

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