title: Letter: Transfer of ampicillin resistance from Shigella dysenteriae type 1 to Escherichia coli.
mesh_terms: D000667:Ampicillin / Q000494:pharmacology*; D003227:Conjugation, Genetic; D004926:Escherichia coli / Q000187:drug effects*; D010403:Penicillin Resistance; D011815:R Factors; D012762:Shigella dysenteriae / Q000187:drug effects*
chemical_list: D000667:Ampicillin