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. 2021 Jun 21;7(6):e26303. doi: 10.2196/26303

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©Howard Burkom, Wayne Loschen, Richard Wojcik, Rekha Holtry, Monika Punjabi, Martina Siwek, Sheri Lewis. Originally published in JMIR Public Health and Surveillance (https://publichealth.jmir.org), 21.06.2021.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in JMIR Public Health and Surveillance, is properly cited. The complete bibliographic information, a link to the original publication on https://publichealth.jmir.org, as well as this copyright and license information must be included.

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Flow diagram illustrating typical Electronic Surveillance System for the Early Notification of Community-Based Epidemics (ESSENCE) data flow with databases and tables, generalized to account for diversity among user needs and server configurations. API: application program interface; ED: emergency department; GIS: geographic information system.