During the three years 1981-3, 134 (9.1%) of 1473 patients presenting at our clinics were found to be infected with penicillinase producing strains of Neisseria gonorrhoeae (PPNG). Minimum inhibitory concentrations (MICs) of benzylpenicillin and ampicillin against these PPNG strains were 8 mg/l or more, whereas against non-PPNG strains they were consistently 4 mg/l or less. In contrast, the MIC of BRL25000 (two parts amoxycillin and one part clavulanic acid, the beta lactamase inhibitor) was 4 mg/l or less even against PPNG strains. MICs of a number of other drugs commonly used to treat gonorrhoea, such as cephaloridine, cefoxitin, tetracycline, doxycycline, minocycline, kanamycin, and spectinomycin, showed no appreciable differences between non-PPNG and PPNG strains and the MIC of cephaloridine in particular was relatively high. BRL25000 proved to be very effective in the treatment of PPNG infection and cured all of 121 patients treated. A daily dose of 2.25g, cured 105 patients in two days, 11 patients in three days, four patients in four days, and one patient in five days. A new rapid diagnostic method for detecting PPNG strains, capable of application at an outpatient clinic and providing a result on the following day, is described.
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