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Streptococcal group A, C and G pharyngitis in school children: a prospective cohort study in Southern India
J John Melbin Jose1, Kootallur N Brahmadathan2, Vinod J Abraham3
1Department of Microbiology, Christian Medical College, Vellore-632 004, Tamil Nadu, India.
Insights
Diagnosing streptococcal pharyngitis in children is challenging due to high colonization rates. New tests are needed to differentiate between colonization and true infection for accurate diagnosis and treatment.
Area of Science:
- Microbiology
- Pediatric Infectious Diseases
- Epidemiology
Background:
- Diagnosing streptococcal pharyngitis in children is complicated by high colonization rates and similar symptoms caused by other pathogens.
- Distinguishing between silent colonization and active infection is crucial for appropriate treatment.
Purpose of the Study:
- To characterize the epidemiology of Lancefield Group A, C, and G beta-hemolytic streptococcus (GAS, GCS, GGS) in school-aged children.
- To assess the accuracy of throat cultures in diagnosing streptococcal pharyngitis.
Main Methods:
- A 2-year prospective study involving 307 school children aged 7-11 years.
- Collection and analysis of throat cultures to identify streptococcal species and emm types.
- Correlation of culture results with clinical presentation to estimate true pharyngitis prevalence.
Main Results:
- Group G streptococcus (GGS) and GAS were common in both colonization and symptomatic sore throats; GCS was rare.
- Throat culture positivity reflected true streptococcal pharyngitis in only 26% of cases, varying significantly with colonization frequency.
- Multiple GAS emm types, including those linked to severe disease, were identified, though no severe complications occurred.
Conclusions:
- Clinical diagnosis of streptococcal pharyngitis remains difficult due to high colonization rates and overlapping symptoms.
- Current diagnostic methods are insufficient, highlighting the need for rapid, point-of-care tests distinguishing colonization from infection.
- Further research is needed to improve diagnostic accuracy and guide treatment decisions for pediatric streptococcal pharyngitis.
Abstract:
Diagnosing streptococcal pharyngitis in children on the basis of clinical appearance and throat culture is complicated by high colonisation rates and by the ability of other pathogens to cause clinically similar disease. To characterise the epidemiology of Lancefield Group A, C and G β-haemolytic streptococcus (GAS, GCS and GGS, respectively) in children, we conducted a 2-year prospective study of 307 school children between 7 and 11 years old. GGS and GAS were commonly identified organisms both for silent streptococcal colonisation and symptomatic sore throat, while GCS was uncommonly found. Streptococcal culture positivity at the time of clinical pharyngitis was estimated to reflect true streptococcal pharyngitis in only 26% of instances, with the frequency varying from 54% for children rarely colonised to 1% for children frequently colonised. Numerous GAS emm types were identified, including several types previously associated with severe pharyngitis (e.g. emm types 1, 3 and 28). No severe complications were seen in any child. These data suggest that the clinical diagnosis of streptococcal pharyngitis is likely to remain difficult and that treatment decisions will remain clouded by uncertainty. There remains a need for organism-specific rapid point-of-care streptococcal diagnostic tests and tests that can distinguish between streptococcal colonisation and disease.
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