Clinical score card for diagnosis of group A streptococcal sore throat

Area of Science:

• Pediatrics
• Infectious Diseases
• Clinical Diagnostics

Background:

• Group A beta hemolytic streptococcus (GAS) sore throat is common in children aged 5-15.
• Untreated GAS can lead to serious conditions like rheumatic fever/rheumatic heart disease (RF/RHD).
• Accurate and timely diagnosis of GAS is crucial for effective management and prevention of complications.

Purpose of the Study:

• To validate a clinical scoring system for the diagnosis of GAS sore throat in children.
• To assess the system's sensitivity and specificity in identifying GAS infections.
• To provide a tool for primary care settings to aid in GAS diagnosis.

Main Methods:

• A study involving 536 children aged 5-15 in a peri-urban slum.
• Fortnightly home visits over one year to record symptoms.
• Throat swabs collected during 918 episodes, with GAS culture confirmation.

Main Results:

• Significant associations found between GAS and throat pain, enlarged tonsils, pharyngeal erythema, and lymphadenopathy.
• A scoring system was developed based on age, season, fever, tonsil size, pharyngeal signs, lymphadenopathy, and throat pain.
• A clinical score of 15 or more demonstrated high sensitivity (91%) and specificity (98%) for GAS pharyngitis diagnosis.

Conclusions:

• The proposed clinical scoring system shows high accuracy for diagnosing GAS pharyngitis.
• Validation and adaptation to local conditions are recommended before widespread implementation in primary care.
• This tool can potentially improve the primary prophylaxis strategy for preventing RF/RHD.