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.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8153864PMC
http://dx.doi.org/10.3201/eid2706.203036DOI Listing

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