The new crown strain XE is a new mutant strain of the new crown virus named XE, a recombinant variant of two Omicron sub-strains. XE spreads faster, and studies have indicated that XE spreads 9.8% faster than Omicron BA.2, which is one of the more potent strains. 1. Strain definition: XE is a recombinant variant of Omicron BA.1 and Omicron’s “sister “recombinant variant of BA.2. Compared with BA.2, XE has no significant difference in the early infection growth rate, but the growth rate is 9.8% higher. In addition, there is no sufficient clinical data on the infectiousness and severity of XE, so it is not possible to determine the degree of risk of XE. 2. Transmission speed: By relevant studies, XE spreads 9.8% faster than BA.2 and is more severe in terms of the degree of disease, and the symptoms of XE infection are more obvious compared with those of other strains. In addition, strains XD and XF, which appear together with XE, are recombinant variants of the new coronavirus and are not uncommon, and most of them die out relatively quickly. Therefore, it is recommended that people should be actively vaccinated against the new coronavirus, pay attention to personal protection, wear masks, wash hands and disinfect frequently, and visit places where people gather less frequently to reduce the chance of contracting the new coronavirus.