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. 2023 Apr 14;69:121–126. doi: 10.1016/j.ajem.2023.04.005

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Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

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Fig. 1 — Weekly trends of total all-cause ED visits (A) and ED visits by age group, race, and ethnicity (B)— National Syndromic Surveillance Program (NSSP)*, United States, December 30, 2018–March 27, 2022.

Abbreviations: ED = emergency department; NSSP = National Syndromic Surveillance Program.

* NSSP is a collaboration among CDC, local, and state health departments, and federal, academic, and private sector partners. To reduce artifactual impact from changes in reporting patterns, analyses were restricted to facilities with a coefficient of variation ≤40 and ≥ 75% complete information on race and ethnicity throughout 2019–2022. Visit data from 1595 facilities were included in this analysis. All facilities from Connecticut; District of Columbia; Georgia; Linn County, IA; Maryland; New Jersey; New York City; North Carolina; Ohio; Pennsylvania; San Mateo, CA; and Texas Region 6/5 were not included in this analysis because they did not meet the inclusion criteria.