Streptococcal antibodies among rural school children in Bangladesh

Area of Science:

• Immunology
• Pediatrics
• Clinical Chemistry

Background:

• Group A streptococcal antibody levels vary geographically.
• Accurate reference values for anti-streptolysin O and anti-deoxyribonuclease B are needed for Bangladeshi children.
• Previous studies have not quantitatively determined these antibody levels in this population.

Purpose of the Study:

• To determine the reference values for anti-streptolysin O (ASO) and anti-deoxyribonuclease B (anti-DNase B) in apparently healthy rural Bangladeshi children.
• To provide essential data for physicians and clinical laboratories in Bangladesh for diagnosing streptococcal infections.
• To establish population-specific normal ranges for these key immunological markers.

Main Methods:

• Quantitative measurement of anti-streptolysin O using an auto-analyzer.
• Quantitative measurement of anti-deoxyribonuclease B using the microtitre method.
• Study involved 361 healthy rural Bangladeshi primary school children aged 5–14 years.

Main Results:

• The geometric mean titre for anti-streptolysin O was 241 IU/ml.
• The geometric mean titre for anti-deoxyribonuclease B was 222 IU/ml.
• The upper limit of normal values (80th percentile) were 390 IU/ml for ASO and 340 IU/ml for anti-DNase B.

Conclusions:

• The determined reference values for ASO and anti-DNase B are essential for Bangladeshi children.
• These population-specific limits will improve the accuracy of diagnosing group A streptococcal infections.
• The findings will benefit physicians, epidemiologists, and laboratory personnel in Bangladesh.