[Study on the pathogenic factors of pathogenic streptococci]

Area of Science:

• Microbiology
• Infectious Diseases
• Pathogenesis

Background:

• Streptococcus pyogenes causes pharyngitis, tonsillitis, and severe invasive infections like necrotizing fasciitis.
• Streptococcus pneumoniae is a common cause of otitis media and pneumonia, particularly in the elderly.
• Increasing antibiotic resistance in Streptococcus pneumoniae clinical isolates is a significant concern.

Purpose of the Study:

• To review the molecules and pathogenic mechanisms of Streptococcus pyogenes and Streptococcus pneumoniae.
• To highlight the rising trend of severe invasive streptococcal infections in Japan.
• To discuss the challenges posed by antibiotic-resistant Streptococcus pneumoniae.

Main Methods:

• Literature review of pathogenic molecules.
• Analysis of pathogenic mechanisms.
• Overview of clinical trends and antibiotic resistance.

Main Results:

• Streptococcus pyogenes employs specific molecules for pharyngeal infection and invasive disease.
• Streptococcus pneumoniae utilizes distinct mechanisms for respiratory tract infections.
• A significant proportion of clinical Streptococcus pneumoniae isolates show resistance to multiple antibiotics.

Conclusions:

• Understanding streptococcal pathogenesis is crucial for combating infections.
• Emerging severe invasive streptococcal infections require urgent attention.
• Antibiotic resistance in Streptococcus pneumoniae necessitates the development of novel therapeutic strategies.