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Pathology (DLF, PV 1) and Bacteriology (DRB, DD, DMW) Divisions, U.S. Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD
Sixty male BALB/c mice were inoculated intraperitoneally with either a sublethal or a lethal dose of Burkholderia mallei China 7 strain, then killed at multiple time points postinoculation. Histopathologic changes were qualitatively similar in both groups and consisted of pyogranulomatous inflammation. In sublethal study mice, changes were first seen at 6 hours in mediastinal lymph nodes, then in spleen, liver, peripheral lymph nodes, and bone marrow at day 3. These changes generally reached maximal incidence and severity by day 4 but decreased by comparison in all tissues except the liver. Changes were first seen in lethal study mice also at 6 hours in mediastinal lymph nodes and in spleens. At day 1, changes were present in liver, peripheral lymph nodes, and bone marrow. The incidence and severity of these changes were maximal at day 2. In contrast to sublethal study mice, the incidence and severity of the changes did not decrease through the remainder of the study. The most significant difference between the two groups was the rapid involvement of the spleen in the lethal study mice. Changes indicative of impaired vascular perfusion were more frequently seen in the sublethal study mice. Our findings indicate that mice are susceptible to B. mallei infection and may serve as an appropriate model for glanders infection in a resistant host such as human beings. Additionally, by immunoelectron microscopy, we showed the presence of type I O-antigenic polysaccharide (capsular) antigen surrounding B. mallei.
Key words: Burkholderia mallei; capsular antigen; glanders; immunohistochemistry; intraperitoneal inoculation; mice; Mus.
Request reprints from Dr. D. L. Fritz, U.S. Army Medical Research Institute of Infectious Diseases, ATTN: MCMR-UIP-D, 1425 Porter Street, Fort Detrick, MD 21702-5011 (USA). E-mail: david.fritz{at}det.amedd.army.mil.
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