Comparative modeling of tuberculosis epidemiology and policy outcomes in California

Nicolas A. Menzies, Andrea Parriott, Sourya Shrestha, David W. Dowdy, Ted Cohen, Joshua A. Salomon, Suzanne M. Marks, Andrew N. Hill, Carla A. Winston, Garrett R. Asay, Pennan Barry, Adam Readhead, Jennifer Flood, James G. Kahn, Priya B. Shete

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Abstract

Rationale: Mathematical modeling is used to understand disease dynamics, forecast trends, and inform public health prioritization. We conducted a comparative analysis of tuberculosis (TB) epidemiology and potential intervention effects in California, using three previously developed epidemiologic models of TB. Objectives: To compare the influence of various modeling methods and assumptions on epidemiologic projections of domestic latent TB infection (LTBI) control interventions in California. Methods: Wecompared model results between 2005 and 2050 under a base-case scenario representing current TB services and alternative scenarios including: 1) sustained interruption of Mycobacterium tuberculosis (Mtb) transmission, 2) sustained resolution of LTBI and TB prior to entry of new residents, and 3) one-time targeted testing and treatment of LTBI among 25% of non-U.S.-born individuals residing in California. Measurements and Main Results: Model estimates of TB cases and deaths in California were in close agreement over the historical period but diverged for LTBI prevalence and new Mtb infections-outcomes for which definitive data are unavailable. Between 2018 and 2050, models projected average annual declines of 0.58-1.42%inTB cases,without additional interventions.A one-time LTBI testing and treatment intervention among non-U.S.- born residents was projected to produce sustained reductions in TB incidence. Models found prevalent Mtb infection and migration to be more significant drivers of futureTBincidence than local transmission. Conclusions: All models projected a stagnation in the decline of TB incidence, highlighting the need for additional interventions including greater access to LTBI diagnosis and treatment for non-U.S.-born individuals. Differences in model results reflect gaps in historical data and uncertainty in the trends of key parameters, demonstrating the need for high-quality, up-to-date data on TB determinants and outcomes.

Original languageEnglish (US)
Pages (from-to)356-365
Number of pages10
JournalAmerican journal of respiratory and critical care medicine
Volume201
Issue number3
DOIs
StatePublished - Feb 1 2020

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Keywords

  • Immigration
  • Infectious disease modeling
  • Latent tuberculosis infection
  • Public health
  • Tuberculosis

ASJC Scopus subject areas

  • Pulmonary and Respiratory Medicine
  • Critical Care and Intensive Care Medicine

Cite this

Menzies, N. A., Parriott, A., Shrestha, S., Dowdy, D. W., Cohen, T., Salomon, J. A., Marks, S. M., Hill, A. N., Winston, C. A., Asay, G. R., Barry, P., Readhead, A., Flood, J., Kahn, J. G., & Shete, P. B. (2020). Comparative modeling of tuberculosis epidemiology and policy outcomes in California. American journal of respiratory and critical care medicine, 201(3), 356-365. https://doi.org/10.1164/rccm.201907-1289OC