| Abstract: | Novel coronavirus pneumonia(COVID-19) is a highly pathogenic infectious disease caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2).Until now, the new crown pneumonia has caused hundreds of millions of people worldwide to be infected. Novel coronavirus pneumonia is still a high level of variation. Due to the high variability of COVID-19, there are already a large number of COVID-19 variant strains that are still at a high level of infection worldwide. Recently, WHO (WHO) released a new variant, "Mu" (μ, B.1.621) may be a high vaccine tolerance. This paper reviews the latest research progress of "Mu" virus strain in detail. |
