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Clostridium difficile in gnotobiotic mice.
A B Onderdonk; R L Cisneros; J G Bartlett (Profiled Author: John Bartlett)
Infection and immunity 1980;28(1):277-82.Abstract
Germfree mice associated with Clostridium difficile developed intestinal disease characterized by polymorphonuclear cell infiltration of the lamina propria, diarrhea, and cecal cytotoxin concentrations positive at a 10(-6) dilution. The numbers of viable bacteria never exceeded 10(10) colony-forming units per g (dry weight). Despite the high toxin levels and chronic inflammation over a 30-day period, the mortality rate was low (less than 2%). Daily treatment of these animals with two oral doses of 2 mg of vancomycin resulted in stool levels of greater than 200 micrograms/ml, well in excess of the minimum inhibitory concentration for C. difficile. This therapy decreased viable cell density by 2 to 3 logs and increased the spore counts from 10(5.8) to 10(7.8) colony-forming units per g (dry weight) by day 7, and animals were free of detectable toxin. However, once therapy was stopped, viable bacteria and spore counts and cytotoxin concentrations returned to previous levels. Treatment of mice with concentrations of clindamycin shown to be inhibitory in vitro had no effect on C. difficile toxin titers or bacterial counts, although the appearance of a clindamycin-resistant population was noted. These data indicate that vancomycin, given orally, decreases the concentration of toxin, but C. difficile survive as spores. By contrast, large populations of vegetative cells and high cytotoxin levels persist when clindamycin is used, even at an inhibitory concentration.
This section shows information related to the publication - computed using the fingerprint of the publication - including related publications, related experts and related grants with fingerprints representing significant amounts of overlap between their fingerprint and this publication. The red dots indicate whether those experts or terms appear within the publication, thereby showing potential and actual connections.
A B Onderdonk; B R Lowe; J G BartlettApplied and environmental microbiology 1979;38(4):637-41.
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