But there was no clear correlation between tet (W) and human activity, nor did tet (W) concentrations match previous measurements of tetracycline antibiotics in river sediments that might have led to the development of local pockets of resistance in microbial communities. (scientificamerican.com)
At the end of the process, the solids contained higher levels of tetracycline antibiotics than the original raw manure. (sciencedaily.com)
The court ruling, won by the Natural Resources Defense Council in New York, commits the FDA to reconsider a ban first proposed in 1977 on the non-therapeutic farmyard use of penicillin and two other types of antibiotics called tetracyclines in animal feed. (newscientist.com)