volume 295, issue 6591, P176-179 1987
DOI: 10.1136/bmj.295.6591.176
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M Powell, C Koutsia-Carouzou, D Voutsinas, A Seymour, J D Williams

Abstract: ampicillin 7-8% (6-2% P-lactamase producers and 1-6% nonproducers), tetracycline 2 , chloramphenicol 1.7%, trimethoprim 4.2%, and sulphamethoxazole 3-5%. Of the 87 capsulated strains, 15 produced P-lactamase, nine were resistantto ampicillin but did not produce P3-lactamase, and two strains, one of which produced P-lactamase, were resistant to chloramphenicol and tetracycline.Since 1977 the prevalence ofresistance to ampiciflin, chloramphenicol, and trimethoprim has increased significantly. During