Journal
ANTIMICROBIAL AGENTS AND CHEMOTHERAPY
Volume 63, Issue 6, Pages -Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/AAC.02244-18
Keywords
cefotaxime; ceftriaxone; intestinal microbiota; metagenomics; pharmacokinetics
Categories
Funding
- Assistance Publique-Hopitaux de Paris (Paris, France)
- Fondation pour la Recherche Medicale [DEQ20161136698]
- Contrat de Recherche Clinique 2013 (Assistance Publique-Hopitaux de Paris, Departement de la Recherche Clinique et du Developpement) [CRC13-179]
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Ceftriaxone has a higher biliary elimination than cefotaxime (40% versus 10%), which may result in a more pronounced impact on the intestinal microbiota. We performed a monocenter, randomized open-label clinical trial in 22 healthy volunteers treated by intravenous ceftriaxone (1 g/24 h) or cefotaxime (1 g/8 h) for 3 days. We collected fecal samples for phenotypic analyses, 16S rRNA gene profiling, and measurement of the antibiotic concentration and compared the groups for the evolution of microbial counts and indices of bacterial diversity over time. Plasma samples were drawn at day 3 for pharmacokinetic analysis. The emergence of 3rd-generation-cephalosporin-resistant Gram-negative enteric bacilli (Enterobacterales), Enterococcus spp., or noncommensal microorganisms was not significantly different between the groups. Both antibiotics reduced the counts of total Gram-negative enteric bacilli and decreased the bacterial diversity, but the differences between the groups were not significant. All but one volunteer from each group exhibited undetectable levels of antibiotic in feces. Plasma pharmacokinetic endpoints were not correlated to alteration of the bacterial diversity of the gut. Both antibiotics markedly impacted the intestinal microbiota, but no significant differences were detected when standard clinical doses were administered for 3 days. This might be related to the similar daily amounts of antibiotics excreted through the bile using a clinical regimen.
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