Single-dose ampicillin prophylaxis does not eradicate enterococcus from the lower genital tract

Area of Science:

• Obstetrics and Gynecology
• Infectious Diseases
• Pharmacology

Background:

• Enterococcus species are common colonizers of the lower genital tract.
• Cesarean delivery is associated with an increased risk of postpartum infections.
• Antibiotic prophylaxis is standard practice to prevent surgical site infections.

Purpose of the Study:

• To determine the prevalence of enterococcus colonization in the lower genital tract of women undergoing cesarean delivery.
• To evaluate the efficacy of a single 2-g intraoperative dose of ampicillin in eradicating enterococcus.

Main Methods:

• Lower genital tract cultures were obtained from 84 women prior to cesarean delivery.
• Participants were randomized to receive either ampicillin or a cephalosporin for prophylaxis.
• Cultures were repeated 24 hours postpartum to assess bacterial eradication.

Main Results:

• Enterococcus colonization was observed in 39.3% of women preoperatively and 42.9% postoperatively.
• Ampicillin successfully eradicated enterococcus in only 29.5% (5 out of 17) of colonized women.
• No significant difference in eradication rates was reported between ampicillin and cephalosporin groups.

Conclusions:

• A single 2-g intraoperative dose of ampicillin is insufficient for eradicating enterococcus from the lower genital tract.
• Current prophylactic regimens may require re-evaluation for optimal enterococcus control in cesarean delivery patients.
• Further studies are warranted to identify more effective antibiotic strategies.