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Study Shows Antibiotics Effective for Treatment of Small Skin Infections


 

New multicenter research, which included Vanderbilt University Medical Center investigators, could change treatment approaches to simple skin abscesses, infections often caused by Staphylococcus aureus (staph) bacteria. The study, published in the New England Journal of Medicine, shows that adults and children who have simple abscesses five centimeters or smaller in diameter have higher cure rates if the abscess is drained in combination with antibiotic treatment, either trimethoprim-sulfamethoxazole (TMP/SMX or Bactrim) or clindamycin, compared to drainage alone.

"We drained the abscess, measured it carefully to make sure it was less than five centimeters and then we randomized participants to receive a placebo or one of the antibiotics--clindamycin or TMP/SMX. What we saw is that in fact antibiotics are helpful. You are more likely to get better if you have antibiotics on board than if you don't. And we also saw in children that clindamycin was associated with fewer recurrences in the one month of follow up," said Buddy Creech, MD, MPH, associate professor of Pediatric Infectious Diseases and director of the Vanderbilt Vaccine Research Program (VVRP).

Staph, including methicillin-resistant S. aureus (MRSA) strains, causes most skin and soft tissue infections, but the appropriate strategy for the treatment of these infections has not been defined. Researchers enrolled 786 participants at six sites, including Vanderbilt. Of the participants, 505 were adults and 281 were children. Bacteria isolated from the abscesses included 527 samples identified as staph and 388 samples identified as MRSA. Patients were randomized to receive either a placebo, clindamycin, or TMP/SMX for 10 days after the drainage of the abscess. Researchers found that clindamycin and TMP/SMX were equally effective in adults, while clindamycin had a slightly higher cure rate in children and more frequently prevented recurrence of infection. Clindamycin had an overall cure rate of about 83 percent of participants; TMP/SMX about 82 percent; and the placebo about 70 percent.

Creech noted that it's important for physicians to culture the fluid from drained abscesses so that infectious disease experts can track strains throughout the community and treat with appropriate antibiotics. In the case of this study, some participants had a clindamycin-resistant staph, rendering that antibiotic ineffective. "Because antibiotics only work if the germ is susceptible to that antibiotic we really need to know the types of strains that are circulating in a community - not just for the individual patient but public health in general," Creech said.

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Tags:
  Buddy Creech,  Staph,  TMP/SMX,  Vanderbilt Vaccine Research Program, Bactrim, Vanderbilt University Medical Center
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