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Tracking the first SARS-CoV-2 Omicron BA.5.1.3 outbreak in China
Xiaoxia Wang1,2, Xiong Zhu2, Yujin Lin2
1West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, Sichuan, China.
Frontiers in Microbiology
|June 5, 2023
Summary
The Omicron BA.5.1.3 subvariant caused a major outbreak in Hainan, China. Genomic analysis revealed unique mutations and an independent evolutionary path for this SARS-CoV-2 variant.
Area of Science:
- Virology
- Genomics
- Epidemiology
Background:
- The SARS-CoV-2 virus continues to evolve, leading to new variants of concern like Omicron.
- Omicron subvariants, particularly BA.5.1.3, have emerged as significant global health threats.
Purpose of the Study:
- To track and characterize the Omicron BA.5.1.3 subvariant during the Hainan Province outbreak in China.
- To analyze the genomic features and evolutionary trajectory of the SARS-CoV-2 BA.5.1.3 variant in Sanya.
Main Methods:
- Whole-genome sequencing of 391 SARS-CoV-2 samples from Sanya, Hainan.
- Phylogenetic analysis to determine the evolutionary relationships of the virus.
- Single-nucleotide polymorphism (SNP) analysis to identify mutations.
Main Results:
- The Hainan outbreak was driven by Omicron subvariant BA.5.1.3, China's first reported case.
- Genomic analysis revealed significant differences in SNP numbers compared to global BA.5.1.3 strains.
- Unique mutations were identified in ORF1ab and ORF3a genes, and the virus formed an independent phylogenetic sub-clade.
Conclusions:
- The study delineated the mutational profile of the BA.5.1.3 outbreak in Hainan.
- Genomic surveillance and data sharing are crucial for understanding and controlling emerging SARS-CoV-2 variants.
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