Delayed skin hypersensitivity as indicator of T-cell function in three population groups.

Area of Science:

• Immunology
• Epidemiology

Background:

• Rheumatoid arthritis incidence varies across populations.
• Lifestyle and environment may influence immune responses and disease prevalence.

Purpose of the Study:

• To compare cell-mediated immunity in rural, underdeveloped Black populations with low rheumatoid arthritis incidence against urban Black and Caucasian populations with high incidence.
• To investigate potential immunological differences linked to lifestyle and disease prevalence.

Main Methods:

• Utilized delayed skin hypersensitivity testing with seven antigens and a control.
• Compared immune responses across three distinct population groups: rural traditional Black, urban Black, and urban Caucasian.

Main Results:

• The rural group displayed a statistically significant inhibition of cell-mediated immunity, with 37% showing an anergic response.
• Urban Black populations showed an intermediate response, while the Caucasian group exhibited a more marked response.
• The anergic response in the healthy rural group, despite resistance to infections, highlights the need for cautious interpretation.

Conclusions:

• Interpretation of anergic responses in underdeveloped populations requires careful consideration.
• The role of altered cell-mediated immunity in the low incidence of rheumatoid arthritis among underdeveloped populations remains speculative.