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[Clinical and immunogenetic aspects of children with local and multiple forms of primary tuberculosis]
Insights
Unfavorable premorbid factors and specific human leukocyte antigen (HLA) types significantly increase tuberculosis risk in children. Early identification of these risk factors is crucial for targeted prevention strategies.
Area of Science:
- Immunogenetics
- Pediatric Infectious Diseases
- Tuberculosis Research
Background:
- Tuberculosis (TB) remains a significant global health challenge, particularly in pediatric populations.
- Understanding the interplay of genetic predisposition and environmental factors is crucial for TB prevention.
- Previous studies have indicated a role for host genetics in TB susceptibility, but specific risk markers in children require further elucidation.
Purpose of the Study:
- To investigate the immunogenetic factors associated with tuberculosis development in preschool children.
- To identify specific human leukocyte antigen (HLA) alleles that confer increased risk for childhood tuberculosis.
- To assess the influence of premorbid conditions on tuberculosis onset and progression in children.
Main Methods:
- Immunogenetic analysis was performed on 146 preschool children diagnosed with tuberculosis (local and multiple lesions) and 148 healthy controls.
- Data on premorbid background, including BCG vaccination quality, family contact history, and co-existing diseases, were collected.
- Statistical analysis was employed to determine the association between specific HLA antigens and tuberculosis risk, as well as the impact of premorbid factors.
Main Results:
- An unfavorable premorbid background, encompassing low-quality BCG vaccination, family tuberculous exposure, and associated diseases, was identified as a key factor in disease onset.
- Systemic immunity shifts were observed, varying with age, inflammation phase, and clinical severity.
- The presence of HLA antigens DR2, DR5, Cw2, and Cw4 was significantly associated with a 5-9 fold increased risk of developing tuberculosis in children.
Conclusions:
- Premorbid conditions play a critical role in the pathogenesis of tuberculosis in preschool children.
- Specific HLA alleles (DR2, DR5, Cw2, Cw4) are strong genetic markers for increased tuberculosis susceptibility in this age group.
- These findings underscore the importance of incorporating immunogenetic screening and risk assessment into strategies for preventing and managing childhood tuberculosis.
Abstract:
Immunogenetic examination of 146 preschool children with local and multiple tuberculous lesions and 148 controls found out the key role of unfavourable premorbid background (low-quality BCG vaccine, family contacts, associated diseases) in the disease onset. General trends in systemic immunity shifts are characterized. These depend on the age, inflammation phase, severity of clinical symptoms. Representation of antigens HLA DR2, DR5, Cw2, Cw4 indicates that a child has a 5-9 times greater risk to develop tuberculosis. These data should be allowed for in forming groups of higher risk among children.