A total of 385 urine specimens from suspected urinary tract infections were subjected to bacteriological analysis and susceptibility testing at a major university hospital laboratory in Tehran. A battery of eight beta-Iactam antibiotics, commonly prescribed in Iran, and three third-generation cephalosporins (ceftazidime, ceftriaxone and ceftizoxime) that are usually reserved for limited us...

Urinary tract infections are considered of great relevance among bacterial origin as one the third most important worldwide. These caused by bacteria belonging to Enterobacteriaceae family, such Escherichia coli, which is frequently isolated uropathogen. The objective was determine level resistance cefotaxime and ceftazidime in strains from urinary infections. Material methods. study were patie...

The ampicillin resistance of clinical isolates of Shigella sonnei is due to beta-lactamase production. Two kinds of resistance are found: low level, nontransmissible; and high level, tranmissible. The nontransmissible type of resistance results from a chromosomal mutation which increases the production of a beta-lactamase that hydrolyses cephalosporins relatively rapidly and gives cephalothin r...