Tuberculin reactivity in a population of schoolchildren with high BCG vaccination coverage
Rev. panam. salud pública
; 13(5): 285-293, May 2003. tab, graf
Artigo
em Inglês
| LILACS
| ID: lil-346136
Biblioteca responsável:
BR1.1
RESUMO
OBJECTIVE:
To investigate the influence of BCG vaccination or revaccination on tuberculin skin test reactivity, in order to guide the correct interpretation of this test in a setting of high neonatal BCG vaccination coverage and an increasing BCG revaccination coverage at school age.METHODS:
We conducted tuberculin skin testing and BCG scar reading in 1148 children aged 7-14 years old in the city of Salvador, Bahia, Brazil. We measured the positive effect of the presence of one or two BCG scars on the proportion of tuberculin skin test results above different cut-off levels (induration sizes of > 5 mm, > 10 mm, and > 15 mm) and also using several ranges of induration size (0, 1-4, 5-9, 10-14, and > 15 mm). We also measured the effects that age, gender, and the school where the child was enrolled had on these proportions.RESULTS:
The proportion of tuberculin results > 10 mm was 14.2 percent (95 percent confidence interval (CI) = 8.0 percent-20.3 percent) for children with no BCG scar, 21.3 percent (95 percent CI = 18.5 percent-24.1 percent) for children with one BCG scar, and 45.0 percent (95 percent CI = 32.0 percent-58.0 percent) for children with two BCG scars. There was evidence for an increasing positive effect of the presence of one and two BCG scars on the proportion of results > 5 mm and > 10 mm. Similarly, there was evidence for an increasing positive effect of the presence of one and two scars on the proportion of tuberculin skin test results in the ranges of 5-9 mm and of 10-14 mm. The BCG scar effect on the proportion of results > 5 mm and > 10 mm did not vary with age. There was no evidence for BCG effect on the results > 15 mm.CONCLUSIONS:
In Brazilian schoolchildren, BCG-induced tuberculin reactivity is indistinguishable, for results under 15 mm, from reactivity induced by Mycobacterium tuberculosis infection. BCG revaccination at school age increases the degree of BCG-induced tuberculin reactivity found among schoolchildren. This information should be taken into account in tuberculin skin test surveys intended to estimate M. tuberculosis prevalence or to assess transmission patterns as well as in tuberculin skin testing of individuals used as an auxiliary tool in diagnosing tuberculosis. Taking this information into consideration is especially important when there is increasing BCG revaccination coverage
Texto completo:
Disponível
Coleções:
Bases de dados internacionais
Contexto em Saúde:
ODS3 - Saúde e Bem-Estar
/
Doenças Negligenciadas
/
ODS3 - Meta 3.3 Acabar com as doenças tropicais negligenciadas e combater as doenças transmissíveis
Problema de saúde:
Meta 3.3: Acabar com as doenças tropicais negligenciadas e combater as doenças transmissíveis
/
Doenças Negligenciadas
/
Tuberculose
/
Zoonoses
/
Tuberculose
Base de dados:
LILACS
Assunto principal:
Teste Tuberculínico
/
Vacina BCG
Tipo de estudo:
Estudo diagnóstico
/
Pesquisa qualitativa
/
Fatores de risco
Limite:
Adolescente
/
Criança
/
Feminino
/
Humanos
/
Masculino
País/Região como assunto:
América do Sul
/
Brasil
Idioma:
Inglês
Revista:
Rev. panam. salud pública
Assunto da revista:
Saúde Pública
Ano de publicação:
2003
Tipo de documento:
Artigo
País de afiliação:
Brasil
/
Reino Unido
Instituição/País de afiliação:
London University/GB
/
Universidade Federal da Bahia/BR