Giuseppe MichieliAug 15, 2023
[Correspondence] #Omicron #neutralisation: #RBD-dimer #booster versus #BF7 and #BA52 breakthrough #infection https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(23)01367-3/fulltext?rss=yes #china #vaccines #pandemic #immunology #research #science
Vesturøy DaveJul 4, 2023

Analysis of a super-transmission of #SarsCoV2 #Omicron variant #ba52 in the outdoor night market

Results: The point source outbreak of #COVID19 in Qingkou night market contained a cluster of 131 secondary cases. In a less-enclosed place like the Qingkou night market, #aerosols with BA.5.2 strain released by patients could suspend in ambient air up to 1 h 39 min and still be contagious.

https://www.frontiersin.org/articles/10.3389/fpubh.2023.1153303/full

#COVID #MaskUP #CovidIsNotOver #CovidIsAirborne #WearAMask #CleanAir

Analysis of a super-transmission of SARS-CoV-2 omicron variant BA.5.2 in the outdoor night market

IntroductionThe COVID-19 pandemic continues to ravage the world, and mutations of the SARS-CoV-2 continues. The new strain has become more transmissible. The role of aerosol transmission in the pandemic deserves great attention.MethodsIn this observational study, we collected data from market customers and stallholders who had been exposed to the virus in the Qingkou night market on July 31 and were subsequently infected. We analyzed the possible infection zones of secondary cases and aerosol suspension time in ambient air. We described and analyzed the characteristics of the secondary cases and the transmission routes for customers.ResultsThe point source outbreak of COVID-19 in Qingkou night market contained a cluster of 131 secondary cases. In a less-enclosed place like the Qingkou night market, aerosols with BA.5.2 strain released by patients could suspend in ambient air up to 1 h 39 min and still be contagious.ConclusionAerosols with viruses can spread over a relatively long distance and stay in ambient air for a long time in a less enclosed space, but shorter than that under experimental conditions. Therefore, the aerosol suspension time must be considered when identifying and tracing close contact in outbreak investigations.

Frontiers
Giuseppe MichieliJan 6, 2023
#China, Pang Xinghuo, Deputy Director of #Beijing CDC and Member of the National Expert Group on New Coronavirus Pneumonia: ''During the monitoring of variant strains in the local #population, the city has not found the prevalence of #XBB, #BQ1 and other strains. #BF7 and #BA52, a subclade of BA.5, were still the dominant strains among the prevailing strains.'', https://news.sina.com.cn/c/2023-01-06/doc-imxzfymz2059134.shtml
北京暂未发现XBB变异株的流行

北京暂未发现XBB变异株的流行

Giuseppe MichieliJan 4, 2023
''For locally-acquired infections, data presented were based on more than 2000 #genomes collected & sequenced from 1 Dec. '22. #China #CDC analysis showed a predominance of #Omicron #BA52 & #BF7 among locally acquired infections. BA.5.2 & BF.7 together accounted for 97.5% of all local infections as per genomic sequencing. A few other known Omicron sublineages were also detected albeit in low percentages... no new variant has been reported'', https://www.who.int/news/item/04-01-2023-tag-ve-statement-on-the-3rd-january-meeting-on-the-covid-19-situation-in-china
TAG-VE statement on the meeting of 3 January on the COVID-19 situation in China

The Technical Advisory Group on Virus Evolution (TAG-VE) meets regularly to review the latest scientific evidence on circulating SARS-CoV-2 variants and advises WHO on whether a change in public health strategies are warranted. The TAG-VE met on 3 January 2023 to discuss the COVID-19 situation in mainland China.

Giuseppe MichieliJan 1, 2023
''According to the study, 30 #Omicron strains that have been identified globally were measured in more than 300 randomly selected viral #WGS from #patients in #Shanghai, including mainly #BF7, #BA52, and the recently emerged #BQ1 and #XBB.'', https://journal.hep.com.cn/fmd/EN/10.1007/s11684-022-0981-7
Primary assessment of the diversity of Omicron sublineages and the epidemiologic features of autumn/winter 2022 COVID-19 wave in Chinese mainland

Frontiers of Medicine
Giuseppe MichieliDec 27, 2022
''Since the beginning of December, the #China CDC has completed the #WGS of 1,142 cases through a sampling survey and found that the #Omicron subvariants #BA52 and #BF7 were the dominant strains, accounting for more than 80 percent of the total, said Xu. There are also seven other subvariants of Omicron circulating.'', GT: https://www.globaltimes.cn/page/202212/1282775.shtml
No new coronavirus variant found in China as Omicron still ‘dominant’ - Global Times