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Hospital drains may be fueling antibiotic resistance. A Swedish study found that wastewater from hospital sewers actively promotes the growth of antibiotic-resistant bacteria — unlike municipal wastewater, which had no such effect. The key culprit? Ciprofloxacin, one of the world's most widely used antibiotics, excreted by patients and flowing straight into the pipes.
Hospital drains may be doing more harm than we thought. Researchers from the University of Gothenburg collected wastewater from 10 hospitals and 8 municipal treatment plants in Sweden and found that hospital sewer water actively selected for antibiotic-resistant bacteria — while municipal wastewater had no such effect. The study, published in Nature Communications, provides some of the strongest direct evidence yet that antibiotics excreted by patients are driving resistance evolution right inside hospital pipes.
The main offender identified was ciprofloxacin, a widely used fluoroquinolone antibiotic, with cefotaxime (a beta-lactam) playing a secondary role. Biofilms — slimy microbial communities — growing on surfaces inside hospital sewers showed significantly higher antibiotic resistance than the wastewater itself, suggesting active, ongoing resistance selection in the environment.
Key Takeaways:
Why it matters: This research helps pinpoint where and why antibiotic resistance emerges environmentally, giving public health officials and hospital administrators a clearer target for intervention — from antibiotic stewardship programs to wastewater treatment upgrades.
