“…The available information is usually rather approximate, e.g., about 50% of world production is said to be applied in agriculture and aquaculture [3]. Concrete data have been published for the therapeutic use of antibiotics for farm animals in France in 1989 and include 50,000 kg ilactam antibiotics, 57,100 kg aminoglycosides, 99,600 kg chloramphenicol, 116,800 kg tetracyclines, 37,000 kg macrolides, 138,600 kg sulfonamides, 77,200 kg nitrofuran, 3700 kg quinoxaline, and 45,300 kg nitroimidazole [10]. For The Netherlands, veterinary usage of 300,000 kg of antibiotics in the year 1990 was calculated to result in 125, 430, and 55 mg/kg per year for pigs, poultry, and cattle, respectively [11].…”