Prevalence of emm types and antibiotic resistance of group A streptococci in Austria

Area of Science:

• Microbiology
• Epidemiology
• Infectious Diseases

Background:

• Streptococcus pyogenes, a significant human pathogen, causes various infections.
• Understanding emm type prevalence and antibiotic resistance is crucial for public health.
• Previous data on emm types and resistance in Australia is limited.

Purpose of the Study:

• To determine the prevalence of emm types in Streptococcus pyogenes isolates.
• To analyze antibiotic resistance patterns of these isolates.
• To compare findings between 1996 and 2003 in South-East Australian patients.

Main Methods:

• Collection and typing of consecutive Streptococcus pyogenes isolates from South-East Australian patients.
• Determination of emm types for each isolate.
• Antimicrobial susceptibility testing to assess antibiotic resistance patterns.

Main Results:

• Emm types 1, 4, 12, and 28 were identified as the predominant types.
• A significant reduction in macrolide resistance was observed, decreasing from 19% in 1996 to 3% in 2003.
• Specific emm types showed varying resistance profiles.

Conclusions:

• Emm types 1, 4, 12, and 28 are key circulating strains of Streptococcus pyogenes in the studied region.
• The observed decrease in macrolide resistance suggests a potential shift in resistance dynamics.
• Continued surveillance of emm types and antibiotic resistance is essential for effective management of Streptococcus pyogenes infections.