[Streptococcal infection in a primary school population. Study during the academic year]

Area of Science:

• Pediatrics
• Infectious Diseases
• Microbiology

Context:

• Investigated 174 children from a national school in Centro Habana-Norte during the 1976-1977 academic year.
• Employed monthly parent interviews for infection and antibiotic history, pharyngeal exudate bacteriology, and quarterly Antistreptolysin O (ASO) titer determination.
• Conducted cardiovascular physical examinations and electrocardiograms in the final month.

Purpose:

• To investigate the prevalence and characteristics of hemolytic streptococci infections in schoolchildren.
• To assess the correlation between bacteriological and serological findings with clinical manifestations of oropharyngeal infections.
• To screen for potential indicators of rheumatic fever and carditis.

Summary:

• 19.22% of pharyngeal exudates tested positive for hemolytic streptococci, with 46.56% identified as Group A.
• Hemolytic streptococci isolation rates varied monthly, peaking in April 1977.
• A high percentage (78.26%) of ASO reactions showed titers of 200 Todd units or higher, with average titers ranging from 382.42 to 463.92 Todd units.
• No significant differences were found between bacteriological/serological results and clinical signs or oropharyngeal condition.
• Crucially, no cases of carditis or rheumatic fever were observed in the studied population.

Impact:

• Highlights the prevalence of hemolytic streptococci in a school-aged population.
• Suggests a potential disconnect between high ASO titers and clinical rheumatic fever presentation in this cohort.
• Underscores the importance of continued surveillance and research into streptococcal infections and their sequelae in pediatric populations.