四环霉素（英语：Tetracycline，/ˌtɛtrəˈsaɪkliːn/，INN），又称四环素，一种聚酮抗生素类药物的泛称。
许多科学家和专家警告说，在动物饲料中滥用抗生素，如青霉素、四环素，会滋生流行病，而这种流行病是没有医药可以防御的。
Many scientists and experts warn that rampant use of antibiotics in animal feed, like penicillin and tetracycline, will breed an epidemic that medicine has no defense against.
该菌对四环素、强力霉素、环丙沙星敏感。
The strains are sensitive to tetracycline, doxycycline and ciprofloxacin.
对青霉素过敏者可使用四环素、红霉素和强力霉素。
For those who are allergic to penicillin, tetracycline, erythromycin and doxycycline could be used.
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