Hepatitis A outbreak: 2018-2020

Since April 2018, the Massachusetts Department of Public Health (MDPH) and local health departments have been investigating an outbreak of hepatitis A. The populations most affected by the outbreak were those with recent experiences of homelessness or unstable housing, and/or substance use disorder. As of May 2020, the outbreak is considered over. Weekly case counts have decreased to a pre-outbreak baseline, and that trend has been sustained for several months. MDPH acknowledges the tremendous work on the part of stakeholders statewide to control and end this outbreak, and encourages continued vaccination of vulnerable populations in accordance with recommendations from the Advisory Committee on Immunization Practices.

Table of Contents

Alerts and advisories

Outbreak epidemiology

Information on number and characteristics of outbreak-associated cases. Updated information will be posted weekly.

Hepatitis A clinical resources for holding a vaccination clinic

Educational materials

Date published: January 7, 2019

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