Sensitivity of the Intertest, Oxoid test, Delvotest P and disc assay to antibiotics

The sensitivity of the Oxoid, Intertest, Delvotest P and disc assay to penicillin G, tetracycline, streptomycin, erythromycin, chloramphenicol, chlortetracycline, neomycin, polymyxin B, ampicillin, novobiocin and gentamicin is presented and compared with literature values for the sensitivity of cheese starter cultures to antibiotics. Recommendations are made concerning the suitability of particular methods for detecting inhibitory levels of antibiotics in milk intended for cheese or starter manufacture.