| antimicrobial resistance and prevalence of extended spectrum beta-lactamase among clinical isolates of gram-negative bacteria in riyadh. | the activity of ciprofloxacin, imipenem and 12 other commonly used antibiotics was evaluated against 106 documented clinical isolates from a medical intensive care unit (icu). the resistance rates to ceftriaxone, cefotaxime, aztreonam and ceftazidime were 42, 25, 24 and 21%, respectively. apart from pseudomonas aeruginosa, all isolates were sensitive to ciprofloxacin and imipenem. complete cross resistance among tested beta-lactam groups was uniformly evident in enterobacter cloacae, citrobacter ... | 1995 | 8667034 |