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Antibiotic-resistant bacteria increased after clindamycin use for common vaginal infection

gee program when the antibiotic-resistance study was completed. Vaginal specimens were collected before treatment began and were compared with those collected during three consecutive follow-up visits. Antibiotic resistance testing also was performed.

Specifically examined were 10 groups of bacteria, including Lactobacillus spp, Gardnerella vaginalis, Mycoplasma hominis, Ureaplasma urealyticum, Escherichia coli, Enterococcus spp, Prevotella bivia, Prevotella spp (pigmented and non-pigmented) and Porphyromonas spp. Analysis included data for women in whom therapy failed as well as those whose infection was cured, he said.

While some bacterial concentrations decreased for both groups, women treated with clindamycin experienced more frequent increases in bacterial concentrations of E. coli than those who were treated with metronidazole. In addition, women treated with metronidazole showed more significant decreases in concentrations of other bacteria such as P. bivia, pigmented Prevotella spp and U. urealyticum compared to clindamycin treatment, Dr. Beigi said.

"Fewer than 1 percent of bacterial samples we tested demonstrated resistance to metronidazole," said Dr. Beigi. "In contrast, 12 percent demonstrated baseline clindamycin resistance, and 53 percent demonstrated resistance to clindamycin after therapy."

In addition, women treated with clindamycin (but not metronidazole) showed evidence of clindamycin-resistant bacteria that persisted for 90 days after treatment at rates as high as 80 percent, Dr. Beigi said.

Metronidazole therapy resulted in increased colonization by protective Lactobacillus species in the week following therapy compared to the women treated with clindamycin.

Testing of pigmented Prevotella spp and P. bivia also revealed significant resistance 75 percent and 57 percent, respectively to clindamycin following therapy. Metronidazole resistance was far more rare at 0.5 percent and did not increa
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1-Nov-2004


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