Cell-mediated immunocompetence among nomadic Turkana children

Area of Science:

• Immunology
• Public Health
• Pediatrics

Background:

• Cell-mediated immune function is crucial for fighting infections and can be compromised by stress.
• Delayed-type hypersensitivity (DTH) testing is a valuable tool for assessing cellular immunity and predicting health outcomes.

Purpose of the Study:

• To assess the cell-mediated immune status of nomadic Turkana children using DTH testing.
• To investigate seasonal variations and demographic factors influencing DTH response in this population.

Main Methods:

• A sample of 64 Turkana children underwent DTH testing using five standardized recall antigens and a control.
• Reactivity was measured by induration size (mm).
• Data were analyzed for variations by antigen, sex, age, and season.

Main Results:

• Tuberculin elicited the strongest DTH response, but 56.2% of children were anergic (nonreactive to all antigens).
• Anergy levels were significantly higher than in U.S. and Peruvian children.
• DTH response showed no significant variation by sex, age, or season.

Conclusions:

• Turkana children exhibit extremely high levels of immunosuppression (anergy).
• This profound immunosuppression is likely a significant factor contributing to the high rates of morbidity and mortality in the population.
• DTH testing is a feasible method for assessing immune status in field settings.