Which antibiotics used in food-producing animals are related to antibiotics used in humans?
A. The majority of antibiotics used in food animals belong to classes of antibiotics that are also used to treat human illness; these include tetracyclines, sulfonamides, penicillins, macrolides, fluoroquinolones, cephalosporins, aminoglycosides, chloramphenicols and streptogramins. Bacteria resistant to antibiotics used in animals will also be resistant to similar antibiotics used in humans. When an ill person is treated with an antibiotic to which the bacteria is resistant, the antibiotic will not help and may even make the illness worse.