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pubmed-article:16113326pubmed:abstractTextHuman diabetics frequently suffer delayed wound healing, increased susceptibility to localized and systemic infections, and limb amputations as a consequence of the disease. Lower-limb infections in diabetic patients are most often polymicrobial, involving mixtures of aerobic, facultative anaerobic, and anaerobic bacteria. The purpose of this study is to determine if these organisms contribute to synergy in polymicrobial infections by using diabetic mice as an in vivo model. The model was the obese diabetic mouse strain BKS.Cg-m +/+ Lepr(db)/J, a model of human type 2 diabetes. Young (5- to 6-week-old) prediabetic mice and aged (23- to 24-week-old) diabetic mice were compared. The mice were injected subcutaneously with mixed cultures containing Escherichia coli, Bacteroides fragilis, and Clostridium perfringens. Progression of the infection (usually abscess formation) was monitored by examining mice for bacterial populations and numbers of white blood cells at 1, 8, and 22 days postinfection. Synergy in the mixed infections was defined as a statistically significant increase in the number of bacteria at the site of injection when coinfected with a second bacterium, compared to when the bacterium was inoculated alone. E. coli provided strong synergy to B. fragilis but not to C. perfringens. C. perfringens and B. fragilis provided moderate synergy to each other but only in young mice. B. fragilis was anergistic (antagonistic) to E. coli in coinfections in young mice at 22 days postinfection. When age-matched nondiabetic mice (C57BLKS/J) were used as controls, the diabetic mice exhibited 5 to 35 times the number of CFU as did the nondiabetic mice, indicating that diabetes was a significant factor in the severity of the polymicrobial infections.lld:pubmed
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pubmed-article:16113326pubmed:dateRevised2009-11-18lld:pubmed
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pubmed-article:16113326pubmed:articleTitleSynergy in polymicrobial infections in a mouse model of type 2 diabetes.lld:pubmed
pubmed-article:16113326pubmed:affiliationDepartment of Biological Sciences, Virginia Tech, 2119 Derring Hall, Blacksburg, VA 24061-0406, USA.lld:pubmed
pubmed-article:16113326pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:16113326pubmed:publicationTypeResearch Support, U.S. Gov't, Non-P.H.S.lld:pubmed
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