Public health problems caused by the high transmission of multidrug-resistant organisms (MDROs) have attracted widespread international attention. However, studies on healthy adults in this field are scarce. In this article, we report the microbiological screening results of 180 healthy adults recruited from 1,222 participants between 2019 and 2022 in Shenzhen, China. Findings show a high MDRO carriage rate of 26.7% in those individuals who did not use any antibiotics in the past 6 months and had not been hospitalized within the past year. MDROs were mainly extended-spectrum β-lactamase-producing Escherichia coli with high resistance to cephalosporin. With the assistance of metagenomic sequencing technology, we also performed long-term observations of several participants and found that drug-resistant gene fragments were prevalent even when MDROs were not detected by drug sensitivity testing. Based on our findings, we suggest that healthcare regulators limit the medical overuse of antibiotics and enact measures to limit its nonmedical use.
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