C P Girish Kumar, Tarun Bhatnagar, G Sathya Narayanan, S S Swathi, V Sindhuja, Valan A Siromany, Daniel VanderEnde, Paul Malpiedi, Rachel M Smith, Susan Bollinger, Ahmed Babiker, Ashley Styczynski
Background: Antimicrobial resistance poses a significant threat to public health globally. We studied the prevalence of colonization with extended-spectrum cephalosporin-resistant Enterobacterales (ESCrE), carbapenem-resistant Enterobacterales (CRE), and colistin-resistant Enterobacterales (Col-RE) in hospitals and the surrounding community in South India.
Methods: Adults from 2 hospitals and the catchment community who consented to provide stool specimens were enrolled. Stools were plated on CHROMagar selective for ESCrE, CRE, and Col-RE. Bacterial identification and antibiotic susceptibility testing were done using Vitek 2 Compact and disc diffusion testing. Colistin broth microdilution was performed for a subset of isolates. Prevalence estimates were calculated with 95% confidence intervals (CIs), and differences were compared across populations using the Pearson χ 2 or Fisher exact test.
Results: Between November 2020 and March 2022, 757 adults in the community and 556 hospitalized adults were enrolled. ESCrE colonization prevalence was 71.5% (95% CI, 68.1%-74.6%) in the community and 81.8% (95% CI, 78.4%-84.8%) in the hospital, whereas CRE colonization prevalence was 15.1% (95% CI, 12.7%-17.8%) in the community and 22.7% (95% CI, 19.4%-26.3%) in the hospital. Col-RE colonization prevalence was estimated to be 1.1% (95% CI, .5%-2.1%) in the community and 0.5% (95% CI, .2%-1.6%) in the hospital. ESCrE and CRE colonization in hospital participants was significantly higher compared with community participants (P < .001 for both).
Conclusions: High levels of colonization with antibiotic-resistant Enterobacterales were found in both community and hospital settings. This study highlights the importance of surveillance of colonization in these settings for understanding the burden of antimicrobial resistance.
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