[Ecological studies on hemolytic streptococci in aged population].

Area of Science:

• Microbiology
• Geriatric Medicine
• Infectious Diseases

Background:

• Hemolytic streptococci infections present different patterns in the elderly compared to children.
• Understanding these differences is crucial for effective diagnosis and treatment in geriatric populations.

Purpose of the Study:

• To investigate the group distribution patterns of hemolytic streptococci in clinical specimens from the elderly.
• To compare these patterns with those observed in children and with normal pharyngeal flora in the elderly.

Main Methods:

• Analysis of hemolytic streptococci isolates from various clinical specimens (sputum, exudate, urine) and throat swabs from elderly individuals.
• Comparison of isolation frequencies and predominant streptococcal groups (e.g., B, G, A) across different specimen types and age groups.
• Examination of serotype distribution for Group B isolates from both clinical and normal flora samples.

Main Results:

• Isolation frequency from the upper respiratory tract was low in the elderly, unlike sputum, exudate, and urine.
• Groups B and G were predominant in sputum and exudate, with Group B dominating urinary tract isolates.
• Normal pharyngeal flora in the elderly showed a low carrier rate, with Groups B and G predominant over Group A, mirroring clinical isolates.

Conclusions:

• The distribution of hemolytic streptococci in clinical specimens from the elderly reflects their normal pharyngeal flora, particularly for sputum isolates.
• Specific serotypes (Ia and III) of Group B streptococci were common in both normal flora and clinical isolates from the elderly.
• Distinct epidemiological patterns of streptococcal infections exist between the elderly and children, necessitating tailored approaches.