Introduction of ORF3a-Q57H SARS-CoV-2 Variant Causing Fourth Epidemic Wave of COVID-19, Hong Kong, China

Abstract excerpt

H ong Kong, China, has had 4 waves of corona- virus disease (COVID-19) outbreaks since the emergence of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in December 2019. By February 1, 2021, Hong Kong had recorded 10,453 reverse transcription PCR (RT-PCR)-confi rmed CO-VID-19 cases, and many of those occurred during the last 2 waves. The third wave occurred during late June to early September 2020...

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