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Author for correspondence: L. H. Gould, E-mail: hgould@health.nyc.gov
We thank Daniel Dewey-Mattia and the entire National Outbreak Reporting System (NORS) Team of the Enteric Diseases Epidemiology Branch, Division of Foodborne, Waterborne and Environmental Diseases, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention for their help with this study.
The authors would also like to acknowledge state and local health departments for collecting and reporting outbreak data.
The authors have no conflicts of interest to disclose.
The findings and conclusions are those of the authors and do not necessarily represent the official position of the CDC.
This research received no specific grant from any funding agency, commercial, or not-for-profit sectors.
© The Author(s) 2019.