Abstract
Characterization of the causative agent(s) for infectious diseases helps in implementing effective control measurements, especially in outbreaks. However, the isolation of the agent(s) from clinical specimens is often challenging and time-consuming. In this study, saliva samples from coronavirus disease 2019 patients were directly subjected to purifying viral RNA, synthesizing DNA amplicons for sequencing, and generating recombinant viruses. Utilizing an updated circular polymerase extension reaction method, we successfully generated chimeric SARS-CoV-2 viruses with sufficient in vitro replication capacity and antigenicity. Thus, the recombinant viruses generated in this study were applicable for evaluating the antivirals. Collectively, our developed method facilitates rapid characterization of specimens circulating in hosts, aiding in the establishment of control measurements. Additionally, this approach offers an advanced strategy for controlling other (re-)emerging viral infectious diseases.
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