| isolation rates of streptococcus pyogenes in patients with acute pharyngotonsillitis and among healthy school children in iran. | we examined three populations from the tehran region and the north part of iran (gilan), in all more than 5000 individuals, for carriage of streptococcus pyogenes (group a streptococci; gas). children or adults with acute pharyngotonsillitis and healthy school children harboured gas in 34-1, 20.0 and 21.0%, respectively. typing of 421 randomly selected isolates showed a predominance of m-types m4, m5, m11, m12, as well as the provisional type 4245; however, many of the isolates were t and m non- ... | 2000 | 10722129 |