Title
Recurrent TB: A systematic review and meta-analysis of the incidence rates and the proportions of relapses and reinfections
Date Issued
01 May 2021
Access level
open access
Resource Type
journal article
Abstract
Background A recurrent tuberculosis (TB) episode results from exogenous reinfection or relapse after cure. The use of genotyping allows the distinction between both. Methods We did a systematic review and meta-analysis, using four databases to search for studies in English, French and Spanish published between 1 January 1980 and 30 September 2020 that assessed recurrences after TB treatment success and/or differentiated relapses from reinfections using genotyping. We calculated person years of follow-up and performed random-effects model meta-analysis for estimating pooled recurrent TB incidence rates and proportions of relapses and reinfections. We performed subgroup analyses by clinical-epidemiological factors and by methodological study characteristics. Findings The pooled recurrent TB incidence rate was 2.26 per 100 person years at risk (95% CI 1.87 to 2.73; 145 studies). Heterogeneity was high (I 2 =98%). Stratified pooled recurrence rates increased from 1.47 (95% CI 0.87 to 2.46) to 4.10 (95% CI 2.67 to 6.28) per 100 person years for studies conducted in low versus high TB incidence settings. Background HIV prevalence, treatment drug regimen, sample size and duration of follow-up contributed too. The pooled proportion of relapses was 70% (95% CI 63% to 77%; I²=85%; 48 studies). Heterogeneity was determined by background TB incidence, as demonstrated by pooled proportions of 83% (95% CI 75% to 89%) versus 59% (95% CI 42% to 74%) relapse for studies from settings with low versus high TB incidence, respectively. Interpretation The risk of recurrent TB is substantial and relapse is consistently the most frequent form of recurrence. Notwithstanding, with increasing background TB incidence the proportion of reinfections increases and the predominance of relapses among recurrences decreases. PROSPERO registration number CRD42018077867
Start page
494
End page
502
Volume
76
Issue
5
OCDE Knowledge area
Sistema respiratorio
Scopus EID
2-s2.0-85100627202
PubMed ID
Source
Thorax
Resource of which it is part
Thorax
ISSN of the container
00406376
Sponsor(s)
Funding The study received financial support from Institutional Collaboration Framework Agreement IV Institute of Tropical Medicine Antwerp, Belgium - Instituto de Medicina Tropical Alexander von Humboldt, Universidad Peruana Cayetano Heredia. LO is supported by an Emerging Global Leader Award from the Fogarty International Center at the National Institutes of Health (K43TW011137). The funders had no role in the design and conduction of this study.
Sources of information: Directorio de Producción Científica Scopus