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River water sources carry more antibiotic resistance genes than reservoirs, a new study finds. Researchers analyzing drinking water sources for 45 million people in China's Poyang Lake basin found that water source type and mobile genetic elements are the strongest drivers of resistance-gene abundance. The findings call for smarter, differentiated water monitoring strategies.
A new study published in Biocontaminant reveals that the type of water source — river, reservoir, or open lake — plays a critical role in determining the presence and abundance of antibiotic resistance genes (ARGs) in drinking water. Researchers from Nanchang University examined 13 drinking water sources in China's Poyang Lake basin, which supplies water to roughly 45 million people, sampling across both winter and summer conditions.
The team detected 13 antibiotics, with livestock farming, domestic sewage, and aquaculture identified as likely pollution contributors. River sources consistently showed higher resistance-gene risk scores, and mobile genetic elements — which help spread resistance between bacteria — emerged as the strongest driver of ARG abundance. Notably, carrying a resistance gene didn't always translate to detectable resistance in lab tests, underscoring the need for multi-layered monitoring.
By the Numbers:
Why it matters: As antimicrobial resistance grows into a global health crisis, understanding where resistance genes enter the water supply is essential. This research highlights that river-fed drinking water sources deserve priority attention — and that chemical, genetic, and bacterial testing must go hand-in-hand to fully assess environmental resistance risks.
