Antibacterial activity of temocillin in combination with other beta-lactam antibiotics

The antibacterial interactions of temocillin with other beta-lactam antibiotics were tested by the checkerboard combination method in Mueller-Hinton agar against 146 strains of Enterobacteriaceae, 35 Pseudomonas aeruginosa strains, and 35 Staphylococcus aureus strains. Most combinations showed either a moderate degree of synergism or indifference. Strains showing occasional antagonism at a particular proportion of concentrations of the test combination, were found to only be indifferent when the mean index of the fractional inhibition concentration of all checkerboard combinations was calculated.