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Did early diagnostic confirmation save lives during the COVID-19 pandemic? Evidence from China

Author

Listed:
  • Chen, Simiao
  • Jin, Zhangfeng
  • Bärnighausen, Till
  • Bloom, David E.

Abstract

This paper investigates the impact of early diagnostic confirmation on the COVID-19 pandemic in a developing country. Using a dataset of the first laboratory-confirmed cases across Chinese cities and an instrumental variable strategy to address endogeneity, we show that reducing the time to publicly confirm the first case in a city by one day led to reductions of 9.4 % in COVID-19 prevalence and 12.7 % in mortality over the subsequent six months. The impact was more pronounced in cities farther from the COVID-19 epicenter, with lower migration exposure, more responsive public health systems, and lower health system capacity utilization. Enhanced social distancing and a less overstressed health system likely drove these effects. Our findings underscore the importance of allocating resources to improve diagnostic technologies; strengthening public health emergency response systems to test for, diagnose, and announce cases of infection; and acting swiftly when facing a potential outbreak.

Suggested Citation

  • Chen, Simiao & Jin, Zhangfeng & Bärnighausen, Till & Bloom, David E., 2025. "Did early diagnostic confirmation save lives during the COVID-19 pandemic? Evidence from China," China Economic Review, Elsevier, vol. 93(C).
    • Handle: RePEc:eee:chieco:v:93:y:2025:i:c:s1043951x25001452
    DOI: 10.1016/j.chieco.2025.102487
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    Keywords

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    JEL classification:

    • I18 - Health, Education, and Welfare - - Health - - - Government Policy; Regulation; Public Health
    • D83 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Search; Learning; Information and Knowledge; Communication; Belief; Unawareness
    • H75 - Public Economics - - State and Local Government; Intergovernmental Relations - - - State and Local Government: Health, Education, and Welfare
    • I12 - Health, Education, and Welfare - - Health - - - Health Behavior
    • J61 - Labor and Demographic Economics - - Mobility, Unemployment, Vacancies, and Immigrant Workers - - - Geographic Labor Mobility; Immigrant Workers

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