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The coombs direct antiglobulin test in Kenyans
Summary
The direct antiglobulin test (DAT) is frequently positive in Kenyan children with malaria, often showing red blood cell coating with IgG and complement proteins. This finding was less common in non-malaria pediatric cases.
Area of Science:
- Immunology
- Hematology
- Infectious Diseases
Background:
- The direct antiglobulin test (DAT) detects antibodies or complement proteins bound to red blood cells (RBCs).
- Malaria and visceral leishmaniasis are significant public health concerns in endemic regions like Kenya.
Purpose of the Study:
- To investigate the incidence and patterns of positive direct antiglobulin tests (DAT) in Kenyan subjects.
- To explore the association of DAT positivity with malaria and visceral leishmaniasis.
Main Methods:
- Conducted direct antiglobulin tests (DAT) on 243 subjects in Kenya.
- Analyzed RBC coating with IgG, C3, and C4 in positive DAT cases.
- Correlated DAT results with clinical diagnoses, age, tribal groups, and geographical malaria endemicity.
Main Results:
- A high incidence of positive DAT was observed in children with malaria (70% had RBCs coated with IgG, C3, and/or C4).
- Positive DAT was significantly less frequent (12%) in pediatric patients without malaria.
- Higher DAT positivity rates were noted in children from malaria-endemic areas and in patients with visceral leishmaniasis.
Conclusions:
- Malaria is strongly associated with positive direct antiglobulin tests (DAT) in Kenyan children, particularly those aged 18 months to five years.
- A unique association of IgG and C4 (without C3) on RBCs was observed in some visceral leishmaniasis patients and schoolchildren from endemic areas.
- DAT positivity warrants further investigation in parasitic infections prevalent in tropical regions.