GABHS is one of the most common pathogen bacteria in human. These kinds of bacteria cause variety of diseases. In addition , they have the capacity to trigger the post infectious syndromes of the acute  rheumatic fever. To use the drugs of choice for streptococcal pharingitis  reduces the risk of subsequent rheumatic fever. In recent years, there have been claims of an increasing number of treatment failure with common drugs for GABHS infection and its believed that the antibiotic resistance may be cause, at least, some parts of these treatment failures.

In this study , 141 strains of GABHS were isolated from patients with streptococcal pharingitis.

All of the patients were among 7 to12 years. 56.7% of patients were female and 43.3% male. It shows that the percentage of erythromycin tolerant is 7.1%. Penicillin tolerant was not found. 96.5% of them were sensitive to penicillin G and 3.5% were intermediate.