The effect of systematic screening of the general population on TB case notification rates.
Telisinghe, L;
Shaweno, D;
Hayes, RJ;
Dodd, PJ;
Ayles, HM;
(2021)
The effect of systematic screening of the general population on TB case notification rates.
International Journal of Tuberculosis and Lung Disease, 25 (12).
pp. 964-973.
ISSN 1027-3719
DOI: https://doi.org/10.5588/ijtld.21.0328
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BACKGROUND: Understanding how TB case notification rates (TB-CNR) change with TB screening and their association with underlying TB incidence/prevalence could inform how they are best used to monitor screening impact.METHODS: We undertook a systematic review to identify articles published between 1 January 1980 and 13 April 2020 on TB-CNR trends associated with TB screening in the general-population. Using a simple compartmental TB transmission model, we modelled TB-CNRs, incidence and prevalence dynamics during 5 years of screening.RESULTS: Of 27,282 articles, seven before/after studies were eligible. Two involved population-wide screening, while five used targeted screening. The data suggest screening was associated with initial increases in TB-CNRs. Increases were greatest with population-wide screening, where screening identified a large proportion of notified people with TB. Only one study reported on sustained screening; TB-CNR trends were compatible with model simulations. Model simulations always showed a peak in TB-CNRs with screening. Following the peak, TB-CNRs declined but were typically sustained above baseline during the intervention. Incidence and prevalence decreased during the intervention; the relative decline in incidence was smaller than the decline in prevalence.CONCLUSIONS: Published data on TB-CNR trends with TB screening are limited. These data are needed to identify generalisable patterns and enable method development for inferring underlying TB incidence/prevalence from TB-CNR trends.
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