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. 2020 Jul 3;69(26):820–824. doi: 10.15585/mmwr.mm6926a3

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All material in the MMWR Series is in the public domain and may be used and reprinted without permission; citation as to source, however, is appreciated.

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The figure is a timeline showing confirmed outbreak-associated hepatitis A virus cases and public health response in Los Angeles County, California, during October 2018–January 2019. — Timeline of confirmed outbreak-associated* hepatitis A virus (HAV) cases and public health response — Los Angeles County, California, October 2018–January 2019^†,§

* Outbreak cases were defined as HAV infections occurring in persons who 1) resided or spent time in the outbreak area and 2) either had infections caused by HAV genotype IB CA cluster A strain or were epidemiologically linked to a person infected with the outbreak strain.

^† Dates have been shifted to preserve patient confidentiality.

^§ Enhanced surveillance continued until the outbreak was declared over in April 2019. Los Angeles County Department of Public Health declared the outbreak over after 100 days without additional outbreak-associated HAV cases (representing two HAV infection incubation periods).