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Abstract We established breakpoints for differentiating ampicillin (ABPC)-susceptible strains from resistant strains among Haemophilus influenzae isolates according to susceptibility to various -lactam antibiotics, using a disc method. Susceptibility testing of isolates for 13 -lactam agents was followed by analysis of the resistance genes, using a polymerase chain reaction (PCR) to identify the TEM-1...
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