| a novel class a extended-spectrum beta-lactamase (bes-1) in serratia marcescens isolated in brazil. | serratia marcescens rio-5, one of 18 extended-spectrum beta-lactamase (esbl)-producing strains isolated in several hospitals in rio de janeiro (brazil) in 1996 and 1997, exhibited a high level of resistance to aztreonam (mic, 512 microgram/ml) and a distinctly higher level of resistance to cefotaxime (mic, 64 microgram/ml) than to ceftazidime (mic, 8 microgram/ml). the strain produced a plasmid-encoded esbl with a pi of 7.5 whose bla gene was not related to those of other plasmid-mediated ambler ... | 2000 | 11036023 |