On the evening of May 28, the weekly report of the Chinese Center for Disease Control and Prevention (in English) published an online document, reporting the first imported Omicron mutant ba 5. Specific conditions of infected persons. It is reported that ba The 5 sequence was first uploaded to the global influenza shared database on March 15, 2022. It came from the nasopharyngeal swab of a patient collected in South Africa on February 25
The imported cases in Shanghai departed from Uganda on April 25 by kl535 of Royal Dutch Airlines, transferred to Amsterdam on April 26, and transferred to Seoul on April 27 by kl535 of Dutch Airlines
The patient has received four doses of anti COVID-19 vaccine in China and Uganda (Beijing Institute of Biological Products Co., Ltd.).
After diagnosis, the patient was transferred to Shanghai Public Health Clinical Center for treatment. He recovered after treatment and was discharged on May 12.
The results of viral gene sequencing showed that the patient was infected with the novel coronavirus Omicron variant ba 5. It is the first Ba reported in China 5. Imported infected persons from abroad.
Introduction by jindongyan, professor and virologist of the school of biomedicine, University of Hong Kong, ba 4. Ba 5 and ba In contrast, the spinous process protein has three amino acids mutated, and the who reminds us to pay more attention to it. However, on the whole, the new subtypes or subtypes reported in the mainland belong to viral drift, and the impact on the original strain is generally relatively slight, so we don't need to worry too much
In addition, both Dandong City of Liaoning Province and Yantai city of Shandong Province recently reported the mutation ba 2.3. This is also the second report of ba 2.3.
Jindongyan pointed out that there is a certain rule in the variation of novel coronavirus. There are about 2 mutations in 30000 nucleotides per month, but the mutant itself will not change much. Moreover, compared with other viruses, the mutation speed of novel coronavirus is low**
He stressed that these minor drift, generally speaking, the biggest role is to help the flow control personnel and disease control experts better carry out their work, and will not have a substantive impact on our epidemic prevention policy and vaccine effect.