| prevalence and beta-lactamase producing bacterial isolates in a teaching hospital in peshawar, pakistan: a four year study. | prevalence of microorganisms was studies in clinical samples of various body fluids (n=12,259), collected from patients at post graduate medical institute hayatabad medical complex (pgmi, hmc) peshawar. only 34.90% of samples exhibited growth, 36.25% of these isolates were gram positive and 63.75% were gram negative bacteria. e. coli was the most prevalent organism (39.45%) followed by s. aureus (32.23%), proteus spp. (9.23%), pseudomonas spp. (6.54%), streptococuss spp. (3.51%), acinetobacter s ... | 2008 | 18930859 |