Letter: Ampicillin-resistant Haemophilus influenzae.
D000667:Ampicillin / Q000494:pharmacology*; D006193:Haemophilus influenzae / Q000187:drug effects*; D007740:L Forms; D008826:Microbial Sensitivity Tests; D009996:Osmotic Fragility; D010403:Penicillin Resistance
D000667:Ampicillin