RESUMEN
Streptococcus pyogenes is the most common cause of bacterial tonsillopharyngitis with a sore throat in children;it can also cause weakening sicknesses such as rheumatic beart disease and other suppurative sequelae; peritonsillar abscess and lymphadenitis. The present study was conducted to determine the occurrence of Streptococcus pyogenes organism and their antibiotics susceptibility usually used to treat tonsilitis in children. From the period 2015-2016, 210 swabs were collected from children complaining of acute tonsillitis who presented to the outpatient department of Al-Karama teaching hospital, Baghdad, Iraq. The results revelated that fortuy-one isolates (19,5%) cases were positive culture for S. pyogenes. The residual results; other organisms, mixed culture and negatively cultured were excluded form the study. The incidence of treptococcus pyogenes tonsillitis was most prvalent in the age group 5-7 years 25 (23.8%) and the lowest in the age group 14-16 years 1 (10%). The isolates showed the frequency resistance percentage to: azithromycin 26 (63.4%), erythromycin 24 (58.5%), clarithromycin 19 (46.3%), 6 (14.6%) toAmoxiclillin + Clavulanic acid (Augmentin) and Clindamycin 5 (12.2%). while some isolates showed the lowest resistance percentage to Cefotaxime 3 (7.3%). S. pyogenes were frequently sensitive to Clindamycin 36 (87.8%), Cefotaxime 32 (78%) and Amoxicillin/clavulanic acid 31 (75.6%). Streptococcal infections are a considerable problem in medical and health centers. The incidence of Streptococcus pyogenes tonsillitis was the most dominant in the age group 5-7 years and antibiotics Clindamycin, Cefotaxime, and Augmentin are more effective against these bacteria in patients with recurrent tonsillitis. The early diagnosis, appropriate infection control easures, and guidelines are needed to prevent the spread of the infections ant the development of complications among patients