Two hundred patients with tonsillectomy (TS) in Basrah, 102(51% ) males and 98(49% ) Females, with male: females ratio (1.04:1) and 50 individual without tonsillitis problems as control group were included in this study, which was done during the period of April,2015 to Jun, 2017. This Include collection of throat swab samples, culturing of samples, identification of causative agents species and antibiotic sensitivity. Gram’s positive bacteria were the commonest microorganisms .the comments’ causative agents was Streptococcus pyogense 30 isolates (15%) followed by Staph.aureus was 28 isolates (14%) isolated from (200) chronic tonsillitis patients before and after tonsillectomy,while the most normal flora was Streptococcus.(α-heamolytic) 45 isolates (90%),,followed by Staphylococcus epidermidis 40(80%) from (50 ) health persons . Most isolated of Streptococcus pyogense were high sensitive to antibiotic such as Clindamycin, Rifampin, and Azithromycin . while moderate sensitive to Penicillin-G Cefotaxime, Cefetriaxone, trimethoprim , and resistant to Augmentine, ampicillin, Cloxacillin, in this study most commo Streptococcus pyogense isolated associated with pyrogenic toxin SPeB (76%),flowed by SPeC (60%)and SPeA (26%) .
Keywords: Streptococcus pyogense, Tonsillectomy, ass tonsillitis patients, pathogenicity
