Studies on the sensitivity of recent field isolates ofE. maximato monensin

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Abstract
The sensitivity of isolates of Eimeria maxima obtained from sites where monensin was used was compared with isolates from sites where the drug was never used. Monensin was successful in controlling [chicken] infections when weight gain was used as a parameter to measure the infection and no differences were found between isolates from different sites. Isolates from sites that were exposed to monensin produced significantly greater numbers of oocysts than isolates from unexposed sites suggesting that a low level of resistance may have developed as a result of exposure to the drug.