ANTIBIOTIC SUSCEPTIBILITY AND MOLECULAR PROPERTIES OF STRAIN STREPTOCOCCUS PYOGENES FROM PATIENTS WITH SOFT TISSUE INFECTIONS AND ANGINA

Abstract

Aim. To compare the molecular properties and antibiotic susceptibility of GAS isolates in patients with respiratory and soft tissue infections. Materials and methods. 86 GAS isolates from patients with respiratory infections and 91 isolates with soft tissue infections were studied. The antimicrobial susceptibility profile of six antibiotics (clindamycin, erythromycin, azithromycin, clarithromycin, tetracycline, levofloxacin) was performed by the microdilution method. PCR and sequencing were used in emm-typing and detection SpeA, SpeB and SpeC genes. Results. Emm-types: 49, 66, 88 and 169 were the most prevalent in patients with soft tissue infections, and 1, 3, 12, 28, 75, 89 - in patients with respiratory infections. One strain was new. Isolates were representatives of the three patterns (A-C, D, E). 116 strains of both groups comprised to pattern E. 15 strains (21%) exclusively from soft tissue infections comprised to pattern D. More than half of isolates from patients with soft tissue infections had resistant to tetracycline. Resistance to macrolides was determined in both groups. In each of the studied groups were isolated strains with multidrug resistant. Eryphrogenic toxins gene A and C was more frequently in respiratory isolates. Conclusion. The group of respiratory GAS was less heterogenic in emm-types composition. Pattern D was not contain any pharyngeal GAS strains. Eryphrogenic toxin gene speA was identified twice as likely in respiratory isolates. The use of tetracycline and macrolides would be ineffective in approximately half of the cases among the patients with soft tissue infections.

Keywords

• group a streptococci
• soft tissue infections
• respiratory infections
• eryphrogenic toxins gene