The impact of HIV and antiretroviral therapy on TB risk in children: a systematic review and meta-analysis

P J Dodd, A J Prendergast, C Beecroft, B Kampmann, J A Seddon, P J Dodd, A J Prendergast, C Beecroft, B Kampmann, J A Seddon

Abstract

Background: Children (<15 years) are vulnerable to TB disease following infection, but no systematic review or meta-analysis has quantified the effects of HIV-related immunosuppression or antiretroviral therapy (ART) on their TB incidence.

Objectives: Determine the impact of HIV infection and ART on risk of incident TB disease in children.

Methods: We searched MEDLINE and Embase for studies measuring HIV prevalence in paediatric TB cases ('TB cohorts') and paediatric HIV cohorts reporting TB incidence ('HIV cohorts'). Study quality was assessed using the Newcastle-Ottawa tool. TB cohorts with controls were meta-analysed to determine the incidence rate ratio (IRR) for TB given HIV. HIV cohort data were meta-analysed to estimate the trend in log-IRR versus CD4%, relative incidence by immunological stage and ART-associated protection from TB.

Results: 42 TB cohorts and 22 HIV cohorts were included. In the eight TB cohorts with controls, the IRR for TB was 7.9 (95% CI 4.5 to 13.7). HIV-infected children exhibited a reduction in IRR of 0.94 (95% credible interval: 0.83-1.07) per percentage point increase in CD4%. TB incidence was 5.0 (95% CI 4.0 to 6.0) times higher in children with severe compared with non-significant immunosuppression. TB incidence was lower in HIV-infected children on ART (HR: 0.30; 95% CI 0.21 to 0.39). Following initiation of ART, TB incidence declined rapidly over 12 months towards a HR of 0.10 (95% CI 0.04 to 0.25).

Conclusions: HIV is a potent risk factor for paediatric TB, and ART is strongly protective. In HIV-infected children, early diagnosis and ART initiation reduces TB risk.

Trial registration number: CRD42014014276.

Keywords: Tuberculosis.

Conflict of interest statement

Competing interests: None declared.

Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/.

Figures

Figure 1
Figure 1
Preferred Reporting Items for Systematic Review and Meta-Analyses flow chart for systematic review (*one study included both a TB and HIV cohort17).
Figure 2
Figure 2
Forest plot for meta-analysis of HIV risk in children aged 2=69.8%). RE, random effects.
Figure 3
Figure 3
Forest plot for Bayesian meta-analysis of HIV risk in children aged

Figure 4

Relative TB incidence in children…

Figure 4

Relative TB incidence in children aged <15 years with HIV by WHO immunological staging (I 2 =87.1%).

Figure 4
Relative TB incidence in children aged 2=87.1%).

Figure 5

Forest plot for meta-analysis of…

Figure 5

Forest plot for meta-analysis of relation between incidence rate ratio for TB incidence…

Figure 5
Forest plot for meta-analysis of relation between incidence rate ratio for TB incidence and CD4% in children aged

Figure 6

Forest plot of protection on…

Figure 6

Forest plot of protection on antiretroviral therapy against TB incidence in children <15 years with HIV infection (I 2…15>

Figure 6
Forest plot of protection on antiretroviral therapy against TB incidence in children 2=79.0%). RE, random effects.

Figure 7

Meta-regression of protection from TB…

Figure 7

Meta-regression of protection from TB incidence in children <15 years by time-on-antiretroviral therapy…

Figure 7
Meta-regression of protection from TB incidence in children
All figures (7)
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References
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Figure 4
Figure 4
Relative TB incidence in children aged 2=87.1%).
Figure 5
Figure 5
Forest plot for meta-analysis of relation between incidence rate ratio for TB incidence and CD4% in children aged

Figure 6

Forest plot of protection on…

Figure 6

Forest plot of protection on antiretroviral therapy against TB incidence in children <15 years with HIV infection (I 2…15>

Figure 6
Forest plot of protection on antiretroviral therapy against TB incidence in children 2=79.0%). RE, random effects.

Figure 7

Meta-regression of protection from TB…

Figure 7

Meta-regression of protection from TB incidence in children <15 years by time-on-antiretroviral therapy…

Figure 7
Meta-regression of protection from TB incidence in children
All figures (7)
Similar articles
Cited by
References
    1. Marais BJ, Gie RP, Schaaf HS, et al. . The natural history of childhood intra-thoracic tuberculosis: a critical review of literature from the pre-chemotherapy era. Int J Tuberc Lung Dis 2004;8:392–402. - PubMed
    1. Dodd PJ, Gardiner E, Coghlan R, et al. . Burden of childhood tuberculosis in 22 high-burden countries: a mathematical modelling study. Lancet Glob Health 2014;2:e453–9. 10.1016/S2214-109X(14)70245-1 - DOI - PubMed
    1. World Health Organization. Global tuberculosis report 2015. Geneva, 2015.
    1. UNAIDS. 2014 progress report on the global plan. Geneva, 2014.
    1. Tobin NH, Aldrovandi GM. Immunology of pediatric HIV infection. Immunol Rev 2013;254:143–69. 10.1111/imr.12074 - DOI - PMC - PubMed
Show all 90 references
MeSH terms
Substances
Related information
Full text links [x]
[x]
Cite
Copy Download .nbib .nbib
Format: AMA APA MLA NLM
Figure 6
Figure 6
Forest plot of protection on antiretroviral therapy against TB incidence in children 2=79.0%). RE, random effects.
Figure 7
Figure 7
Meta-regression of protection from TB incidence in children
All figures (7)

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