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New variant strain Omicron BA.2.3 detected for 1st time in China
Published on: 2022-04-26
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Cases of COVID-19 infection by an evolved sublineage of Omicron's BA.2 mutation, Omicron BA.2.3, were reported on Monday in Yantai, East China's Shandong Province, the first time the strain has been detected in the China.
 

Genetic sequencing shows that 16 cases reported in the port city belong to the same transmission chain, caused by this evolved variant, the city's health authorities said at a news conference on Monday. The new variant has proven to be more contagious with a shorter incubation period.
 

Yantai reported 36 confirmed COVID-19 cases, along with 34 silent carriers on Sunday. The city has recorded an increasing number of cases in recent days. It has vowed to quickly stamp out all transmissions, and to eliminate viral infections within communities as soon as possible.
 

Meanwhile, immunologists said that the emergence of this new strain in China is not expected to make a major difference to the country's epidemic fight. There is a high possibility that this strain was imported from outside of the mainland.
 

Current data has shown no evidence of significant changes in BA.2.3's infectiousness and immune escape capacity, but a growing number of cases have been reported in some countries.
 

The strain's relative growth advantage is 17 percent globally, implying that it is causing more infections worldwide.
 

According to the results of the global sequencing of the COVID-19 gene, Omicron BA.2.3 has now been detected in 49,000 sequences worldwide, accounting for 6.2 percent of all strains, Zhuang cited data as saying. Most of the previous cases were found in Europe.
 

国内首现!山东发现奥密克戎BA.2.3进化分支

4月24日0时至24时,烟台市新增感染者36例,其中确诊病例2例、均为普通型,无症状感染者34例,均已转运至定点医院。
 

新增感染者中:招远市2例确诊病例、22例无症状感染者,均在集中隔离人员中检出。蓬莱市9例,3例在集中隔离人员中检出,其中2例为23日报告的无症状感染者的密切接触者,1例为招远市金岭镇西梧桐夼村到蓬莱人员;另外6例在重点区域风险人员核酸筛查中发现。芝罘区2例,1例在集中隔离人员中检出,1例在重点区域风险人员核酸筛查中发现,均为招远市无症状感染者同时空交集人员。莱州市1例,在集中隔离人员中检出,为23日报告的无症状感染者的共同居住人。
 

烟台市共排查密接1700人、次密接3179人,全部落实隔离管控措施。第一时间开展病毒全基因组测序,截至目前已完成4个区市共16例本土病例基因测序分析,为同一条传播链,病例基因分型为奥密克戎BA.2.3进化分支,目前国内尚未发现。

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