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XBB, an Omicron variant circulating in Europe and the United States with enhanced immune evasion ability, as it was detected in people quarantined in China, XBB quickly attracted attention, and in a series of branches of XBB, the most noteworthy is the "XBB.
1.
5" branch
。 So what are the characteristics of XBB? Will it be more pathogenic and virulent? Will it mainly attack the human gut, as is rumored? Will it trigger a second round of infection? What do you need to know about XBB?
Xu Wenbo, director of the Institute of Virology of the Chinese Center for Disease Control and Prevention: Up to now, there have been 20 series offspring branches produced during the XBB epidemic
.
The proportion of sub-sub-sub-branches of the XBB series has increased
significantly in some countries, especially the United States.
Since August 2022, there have been imported cases of XBB in China, with 16 locally associated cases, and the local surveillance results in December suggest that XBB has no transmission advantage in China, but only 1 case was detected, which is significantly lower
than that from October to November.
There are two main reasons for this:
(1) The Chinese population is generally susceptible
to BA.
5.
2, BF.
7 and XBB and other series of Omicron variants.
(2) In the early stage of the current round of the epidemic in China, especially in Guangzhou and Chongqing, BA.
5.
2 dominated by BA.
5.
2, Beijing and Inner Mongolia were BF.
7 with absolute dominance, BA.
5.
2 and BF.
7 had a certain scale of local cases in many provinces, and these two strains quickly occupied an absolute dominant subtype
nationwide.
Therefore, at this stage, it is difficult for the XBB strain to form a large-scale epidemic
.
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