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. 2021 Sep 13:14:3775-3782.
doi: 10.2147/RMHP.S326051. eCollection 2021.

A Second Wave? What Do People Mean by COVID Waves? - A Working Definition of Epidemic Waves

Stephen X Zhang  1 , Francisco Arroyo Marioli  2 , Renfei Gao  3 , Senhu Wang  4
Affiliations

A Second Wave? What Do People Mean by COVID Waves? - A Working Definition of Epidemic Waves

Stephen X Zhang et al. Risk Manag Healthc Policy. .

Abstract

Introduction: Policymakers and researchers describe the COVID-19 epidemics by waves without a common vocabulary on what constitutes an epidemic wave, either in terms of a working definition or operationalization, causing inconsistencies and confusions. A working definition and operationalization can be helpful to characterize and communicate about epidemics.

Methods: We propose a working definition of epidemic waves in the ongoing COVID-19 pandemic and an operationalization based on the public data of the effective reproduction number R.

Results: Our operationalization characterizes the numbers and durations of waves (upward and downward) in 179 countries.

Discussions: The proposed working definition of epidemic waves provides a common and consistent vocabulary that can enable healthcare organizations and policymakers to make better description and assessment of the COVID crisis to make more informed resource planning, mobilization, and allocation temporally in the continued COVID-19 pandemic.

Keywords: COVID wave; epidemic wave; epidemiology; infection; second wave.

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Conflict of interest statement

The authors declare no competing interests.

References

    1. Wall Street Journal. There isn’t a coronavirus ‘second wave’. Available from:https://www.wsj.com/articles/there-isnt-a-coronavirus-second-wave-115923.... Accessed August27, 2021.
    1. Wall Street Journal. Fauci warns of coronavirus resurgence if states don’t adhere to safety guidelines. Available from:https://www.wsj.com/articles/fauci-warns-of-coronavirus-resurgence-if-st.... Accessed August27, 2021.
    1. BBC News. South Korea says it has a second wave of coronavirus infections — but what does that really mean? Available from:https://www.abc.net.au/news/2020-06-24/coronavirus-covid-19-countries-se.... Accessed August27, 2021.
    1. The conversation. What makes a ‘wave’ of disease? An epidemiologist explains. Available from:https://theconversation.com/what-makes-a-wave-of-disease-an-epidemiologi.... Accessed August27, 2021.
    1. BBC News. Coronavirus: what is a second wave and is one coming? Available from:https://www.bbc.co.uk/news/health-53113785. Accessed August27, 2021.

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