Abstract
Since the first appearance of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in 2019, the virus is still evolving and mutating until now. In this study, we collected 6 throat swabs from patients who diagnosed with COVID-19 in Inner Mongolia, China, to understand the entry of multiple SARS-CoV-2 variants into Inner Mongolia and analyze the relationships between variants and clinical features observed in infected patients. In addition, we performed a combined analysis of clinical parameters associated with SARS-CoV-2 variants of interest, pedigree analysis, and detection of single-nucleotide polymorphisms. Our results showed that the clinical symptoms were generally mild although some patients demonstrated some degree of liver function abnormalities, and the SARS-CoV-2 strain was related to the Delta variant (B.1.617.2), AY.122 lineage. The epidemiological investigations and clinical manifestations confirmed that the variant exhibits strong transmission, a high viral load, and moderate clinical symptoms. SARS-CoV-2 has undergone extensive mutations in various hosts and countries. Timely monitoring of virus mutation can help to monitor the spread of infection and characterize the diversity of genomic variants, thus limiting future waves of SARS-CoV-2 infection.