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Intensive animal farming near China's Poyang Lake spreads antibiotic resistance and heavy metals into soil via manure, increasing health risks.
Intensive pig and chicken farming near China's Poyang Lake is spreading antibiotic resistance genes (ARGs) and heavy metals into agricultural soils, a new study finds.
Despite being labeled low-risk, dried poultry manure increased ARG health risks by over 16,000 times, with resistance genes for tetracycline and sulfonamides rising sharply.
Heavy metals like zinc and copper, used in animal feed, worsened gene transfer by boosting mobile genetic elements, not by causing resistance directly.
The bacterial group Firmicutes was a key carrier.
The findings challenge the safety of processed manure on food crops and call for better treatment methods and stricter controls on antibiotics and metals in animal feed.
El cultivo intensivo de animales cerca del lago Poyang de China propaga la resistencia a los antibióticos y los metales pesados en el suelo a través del estiércol, aumentando los riesgos para la salud.