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the evening of May 28, The “Weekly Report of the Chinese Center for Disease Control and Prevention (English)” published an online article reporting the specific situation of my country’s first imported case of Omicron variant BA.5 infection.
The report states that the prevalence of BA.4 and BA.5 has increased in South Africa in recent weeks , and spread to 19 other countries within 3 months; BA.5 has led to a rise in the number of cases in some countries, such as Portugal, and South Africa has also reported a modest increase in hospitalizations since the end of April.
According to the disclosure of China CDC, the BA.5 sequence was uploaded to the Global Influenza Shared Database for the first time on March 15, 2022. The sequence came from a nasopharyngeal swab of a patient collected in South Africa on February 25. The imported cases from Shanghai departed from Uganda on April 25 (flight KL535), transferred in Amsterdam on April 26, and transferred from Seoul, South Korea (flight KL535) on April 27. The patient has received four doses of the anti-COVID-19 vaccine in China and Uganda (Beijing Institute of Biological Products Co., Ltd.). After the diagnosis, he was transferred to the Shanghai Public Health Clinical Center for treatment. He recovered after treatment and was discharged from hospital on May 12. Virus gene sequencing results showed that the patient was infected with the new coronavirus Omicron subtype variant strain BA.5, which is the first imported BA.5 infection reported in my country.
“Compared with BA.2, BA.4 and BA.5 have three spike proteins. Amino acids are mutated, so the WHO also said that they should observe more.” Jin Dongyan, a professor and virology expert at the School of Biomedical Sciences of the University of Hong Kong, told the People’s Daily Health Client, but overall, the new subtypes or subtypes currently reported in the mainland All subtypes belong to the drift of the virus, and the overall impact on the original strain is relatively slight, so you don’t need to worry too much.
In addition to the above-mentioned imported BA.5 mutant strains, recently, Dandong City, Liaoning Province and Yantai, Shandong Province The city reported the epidemic strain Omicron variant BA.2.3. At 0-24:00 on May 27, Liaoning added 11 new cases of local asymptomatic infections. The epidemic strain was Omicron BA.2.3. It is a new round of epidemic. This is also the second time that the Omicron BA.2.3 strain has been reported in my country.
“There is indeed a certain pattern in the mutation of the new coronavirus. Then its 30,000 nucleotides will have a mutation of 2 nucleotides every month, that is, the mutant itself will not change much. This is very normal. In fact, compared with other viruses, The mutation rate of the new coronavirus is relatively low.” Jin Dongyan introduced that according to the law of virus transmission, this small mutation may be produced by the virus itself when the virus is prevalent in my country, or it may be imported from abroad, depending on the individual strain of the virus. item data.
Jin Dongyan said, “As long as there is no major change in the mutant strain, we don’t need to worry too much. Small drift, generally speaking, the biggest role is to help epidemiologists and disease control experts to work better, and will not have a substantial impact on our epidemic prevention policies and vaccine effects.” p>
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This article was first published on 2022-05-29People’s Daily Health Client “China CDC discloses the first case of Omicron mutation Strain BA.5 imported into Shanghai” (People’s Daily Health Client Wang Aibing Wang Nan)
Editor of this article: Wang Zhen Reviewing director: Yang Xiaoming p>