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From the Purpose: Alert-level systems provide a framework to support clear decision-making, improve accountability and communicate with the public to increase healthy behavior change This briefing note explains why alert-level systems for COVID-19 [coronavirus disease 2019] are effective, compares models from several countries, and provides the key principles and potential pitfalls to be aware of when developing these systems It is intended to provide guidance to local, regional and national governments on best practices for alert-level systems, and on how to clearly communicate what behaviors people should adopt in response to changing COVID-19 conditions in their community Please see the following for more information: Annex 1: How to Create a COVID-19 Alert-Level System and Supporting Communication Tools in Resource-Constrained Settings [https://www hsdl org/?abstract&did=839272];Annex 2: Example of an Alert-Level System and Supporting Communication Tools - U S [https://www hsdl org/?abstract&did=839273];and Annex 3: Example Materials to Communicate Level Change [https://www hsdl org/?abstract&did=839274] COVID-19 (Disease);Warnings;Health risk communication
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