Antibiotic factory waste as fertilizer can spread resistance genes in soil
Wan R, Zheng K, Chen T, Xun Y, Lv J
Soil Health
If you compost or amend your garden beds with industrial biosolids or unfamiliar fertilizers, this study is a reminder that not all organic waste is created equal, some can carry hidden antibiotic-resistant bacteria into the soil your vegetables grow in.
Drug companies produce huge amounts of leftover sludge from making antibiotics like penicillin, and some of that sludge gets turned into fertilizer for farms. Scientists grew lettuce in soil treated with this leftover material and found it could boost antibiotic-resistant genes and bacteria in the soil. The good news: heating and processing the waste before using it as fertilizer cut that resistance risk by about 30%, making it almost as safe as regular soil.
Key Findings
Heat-treating the pharmaceutical waste removed 94.2% of penicillin and 97.3% of clavulanic acid residues before use as fertilizer
Treated waste reduced antibiotic resistance gene counts by 32.1% and their abundance by 27.9% compared to untreated waste, matching levels in control soil
Researchers identified 47 resistance gene biomarkers (7 high clinical risk), 32 bacterial groups (13 potential pathogens), and 21 mobile genetic elements, with two elements (tnpAB and IS91) flagged as key indicators of resistance spread risk
chevron_right Technical Summary
Waste left over from making penicillin and other antibiotics can be recycled as soil fertilizer, but if not properly treated it raises the amount of antibiotic-resistant genes and bacteria in the soil where lettuce grows. A heat-based treatment process cut that resistance risk by roughly 30%, bringing it close to soil that never received the waste at all.
Abstract Preview
Original paper
Antibiotic resistome biomarkers and determinants in lettuce planting soil amended with β-lactam pharmaceutical fermentation residues.
As nutrient-rich biosolids generated by the pharmaceutical industry, pharmaceutical fermentation residues (PFRs) pose high potential for recycling, particularly as organic soil amendments after rem...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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