A study published in the journal Antimicrobial Resistance & Infection Control on 24 September 2026 reports an increase in carbapenem-resistant bacterial colonization among hospitalized patients in Benin. Researchers observed that the prevalence of these bacteria rose from 7.3 percent at the time of admission to 22.7 percent by day 8 of hospitalization. These findings indicate a significant shift in patient status during the course of clinical care within the country. The data provides a specific measure of how colonization rates change as patients remain in medical facilities. This research offers insight into the transmission of resistant organisms in local hospital settings.
Study Scope and Participants
Researchers included 248 participants across five hospitals in Benin to track the spread of carbapenem-resistant bacteria. The study cohort comprised 81 index patients and 81 caregivers providing direct assistance to those individuals. Additionally, the investigation monitored 58 healthcare workers operating within these clinical settings. The final group of participants consisted of 28 household members who maintained regular contact with the patients. By diversifying the participant base, the research team aimed to capture a representative view of transmission dynamics within the medical and home environments. Each participant contributed data that allowed the investigators to map the movement of resistant organisms between hospital wards and domestic spaces. These 248 individuals formed the primary foundation for the findings reported in the study.
Post-Discharge Colonization Trends
Patients and caregivers who tested positive for carbapenem-resistant bacteria at the time of hospital discharge experienced a notable increase in home colonization during the subsequent two weeks. Data collected by the research team shows that prevalence rose from 8.0 percent on the day of discharge to 57.1 percent by day 14 of follow-up. This trend indicates that the domestic environment acts as a secondary site for the persistence and potential transmission of these resistant organisms after clinical care concludes.
Laboratory analysis of the samples gathered throughout the study allowed researchers to identify the specific bacteria involved in these cases. Recovered isolates were predominantly E. Coli, which accounted for 40.4 percent of the findings. Klebsiella pneumoniae represented 19.1 percent of the recovered isolates, while Acinetobacter baumannii made up 10.6 percent. These organisms were selected for further molecular investigation to determine the mechanisms underlying their resistance profiles.
Genomic analysis confirmed the presence of specific resistance genes within these bacterial populations. Investigators identified carbapenem resistance genes blaNDM-5 and blaNDM-1 as the primary determinants driving the resistance observed in the samples. These genetic markers were specifically linked to E. Coli sequence type ST410 and K. Pneumoniae sequence type ST147. By documenting these specific gene-strain combinations, the study provides a detailed profile of the pathogens circulating within the households of the 248 participants. The persistence of these highly resistant strains outside of the clinical setting remains a point of focus for monitoring future transmission patterns in Benin.
