Streptococcal infection in a Junior Detention Centre: a five-year study

Area of Science:

• Infectious Diseases
• Epidemiology
• Microbiology

Background:

• Acute tonsillitis and group A streptococci (GAS) infections were prevalent in a Junior Detention Centre, affecting over 20% of boys.
• GAS, particularly M-type 5, was frequently isolated, correlating with a history of rheumatic fever outbreaks.
• High antibody titres in boys on entry suggested a predisposition to streptococcal infections.

Purpose of the Study:

• To investigate the epidemiology of acute tonsillitis and GAS infections in a closed adolescent male community.
• To evaluate the effectiveness of different diagnostic methods and treatment strategies for GAS infections.
• To assess the role of viruses and the significance of antibody titres in adolescent streptococcal pharyngitis.

Main Methods:

• Retrospective analysis of infection rates and serotypes over a five-year period.
• Comparison of diagnostic yields using different laboratory techniques for GAS isolation, including enrichment media.
• Evaluation of treatment efficacy, focusing on penicillin prophylaxis protocols.

Main Results:

• GAS was isolated from over 40% of boys during their two-month stay; M-type 5 was the most common serotype.
• Penicillin prophylaxis administered on entry was effective in controlling GAS infections.
• Enrichment media and duplicate swabs significantly increased GAS detection rates (77.6%) compared to standard methods (31.7%).
• Four cases of rheumatic fever were documented between 1972 and 1977.
• Viruses were not identified as a significant cause of acute tonsillitis in this population.

Conclusions:

• Adolescent boys in closed communities are highly susceptible to GAS throat infections.
• Effective control requires comprehensive penicillin prophylaxis for all new entrants.
• Laboratory diagnostic practices for GAS should incorporate enrichment techniques for improved sensitivity.