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A custom hepatitis A virus assay for whole-genome sequencing. | LitMetric
Since 2016, the United States has experienced a resurgence in the number of hepatitis A virus (HAV) cases and outbreaks. These outbreaks have been sustained by person-to-person transmission with cases occurring predominantly in high-risk populations including intravenous drug users, individuals experiencing homelessness, and men who have sex with men. To investigate HAV transmission, a molecular-surveillance system consisting of real-time RT-PCR (rRT-PCR) for detection, and a conventional RT-PCR assay for genotyping of HAV, was established in New York State (NYS) in 2019. Since then, a total of 271 HAV-positive serum samples collected from cases across NYS between 2019 and 2021 were identified by rRT-PCR. To rapidly and efficiently generate HAV whole-genome sequences, a custom AmpliSeq™ panel was designed in collaboration with Thermo Fisher. To streamline the process, sample preparation was performed on an Ion Chef and sequencing on an Ion S5XL. Of the 271 HAV-positive samples, the whole-genome sequencing (WGS) assay successfully generated 134 near-complete, high-quality HAV sequences. Phylogenetic analysis of the VP1-2A region identified 216 IB, 48 IA, and 2 IIIA genotypes, while 5 were unable to be typed due to poor sequence in this key region. The HAV whole-genome sequencing approach provided a more efficient and streamlined approach for genotyping HAV compared to previous methods and resulted in phylogenetic trees with enhanced resolution compared to the HAV VP1-2A region alone.
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