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[Association between severe tuberculosis in children and previous BCG immunization in a national referral hospital,
Félix Llanos-Tejada1, Hernán del Castillo
1Servicio de Neumología, Hospital Nacional Dos de Mayo, Lima, Perú. neumofekollate@aol.com
Insights
BCG immunization significantly reduces the risk of severe tuberculosis (TB) in children. Vaccinated children with TB had a 94% lower risk of developing severe forms of the disease.
Area of Science:
- Pediatrics
- Infectious Diseases
- Immunology
Context:
- Tuberculosis (TB) remains a significant global health challenge, particularly in pediatric populations.
- Severe forms of TB, such as miliary and meningoencephalitic TB, are associated with high morbidity and mortality.
- The role of Bacillus Calmette-Guérin (BCG) vaccination in preventing severe TB requires ongoing investigation.
Purpose:
- To investigate the association between BCG immunization and the development of severe tuberculosis in children.
- To quantify the risk reduction of severe TB in BCG-vaccinated children compared to unvaccinated children.
Summary:
- A retrospective study analyzed 2106 pediatric TB cases in Peru (1990-2000).
- Of these, 259 cases were classified as severe TB (miliary or meningoencephalitic).
- BCG vaccination was associated with a 94% lower risk of severe TB (OR = 0.05, 95% CI = 0.03-0.07).
Impact:
- Findings suggest BCG vaccination is highly effective in preventing severe forms of pediatric TB.
- This reinforces the importance of BCG immunization programs for child health and TB control.
- Results provide evidence for public health strategies aimed at reducing TB burden.
Abstract:
The objective of the study was to determine the association between BCG immunization and severe tuberculosis (TB). We performed a retrospective study, including medical records from patients of the pneumology department at the National Children's Institute in Peru, between the years 1990-2000. A total of 2106 TB cases were reviewed, from them 259 patients were severe (miliary TB or meningoencephalitic TB). From all, 497 cases did not have history of BCG vaccination, 202 had severe TB and 295 non-severe TB (OR = 0.05, 95% CI = 0.03 to 0.07). In conclusion, children diagnosed with TB and who have been immunized with BCG, has 94% lower risk of developing severe TB, compared to children with TB non-immunized with BCG.
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