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abstractpubmed· Abstract 2021· item PMID:34013865

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