Haemophilus influenzae type b resistant to chloramphenicol and ampicillin.Br Med J (Clin Res Ed) 1983; 286 doi: https://doi.org/10.1136/bmj.286.6366.722-a (Published 26 February 1983) Cite this as: Br Med J (Clin Res Ed) 1983;286:722
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