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Abstract

A method of treating livestock infected with, or protecting livestock against infection from, bacteria which comprises administering to such livestock an antibacterially effective amount of a quinolonecarboxylic acid or derivative of the formula ##STR1## in which A represents nitrogen or .dbd.C--R.sup.4, R.sup.4 represents hydrogen, fluorine, chlorine, nitro or methyl, B represents ##STR2## and B also represents ##STR3## when R.sup.1 does not denote cyclopropyl, and R.sup.5 represents hydrogen, a branched or unbranched alkyl group which has 1 to 4 carbon atoms and which can optionally be substituted by a hydroxyl or methoxy group, R.sup.6 represents hydrogen, methyl or phenyl, R.sup.7 represents hydrogen or methyl, R.sup.8 represents amino, alkyl- or dialkylamino having 1 or 2 carbon atoms in the alkyl group, aminomethyl, alkyl- or dialkylaminomethyl having 1 or 2 carbon atoms in the alkyl group, R.sup.1 represents an alkyl radical having 1 to 3 carbon atoms, cyclopropyl, 2-fluoroethyl vinyl, methoxy, 4-fluorophenyl or methylamino, R.sup.2 represents hydrogen, alkyl having 1 to 6 carbon atoms, and cyclohexyl, benzyl, 2-oxopropyl, phenacyl and ethoxycarbonylmethyl, R.sup.3 represents hydrogen, methyl or ethyl, Z represents oxygen, nitrogen which is substituted by methyl or phenyl, and .dbd.CH.sub.2 --, or a pharmaceutically utilizable salt thereof.

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First Claim