Changing Molecular Epidemiology of Hepatitis A Virus Infection, United States, 1996–2019

Abstract

Hepatitis A virus (HAV) genotype IA was most common among strains tested in US outbreak investigations and surveillance during 1996–2015. However, HAV genotype IB gained prominence during 2016–2019 person-to-person multistate outbreaks. Detection of previously uncommon strains highlights the changing molecular epidemiology of HAV infection in the United States.

Keywords

• Hepatitis A virus
• genotype
• surveillance
• outbreaks
• technical assistance
• molecular surveillance