Reinfection with BA.2 following infection with BA.1 has been documented, however, initial data from population-level reinfection studies suggest that infection with BA.1 provides strong protection against reinfection with BA.2, at least for the limited period for which data are available.
While reaching the above determination, the TAG-VE also looked at preliminary laboratory data from Japan generated using animal models without any immunity to SARS-CoV-2 which highlighted that BA.2 may cause more severe disease in hamsters compared to BA.1.
They also considered real-world data on clinical severity from South Africa, the United Kingdom, and Denmark, where immunity from vaccination or natural infection is high: in this data, there was no reported difference in severity between BA.2 and BA.1.
WHO will continue to closely monitor the BA.2 lineage as part of Omicron and requests countries to continue to be vigilant, to monitor and report sequences, as well as to conduct independent and comparative analyses of the different Omicron sublineages.
The TAG-VE meets regularly and continues to discuss available data on transmissibility and severity of variants, and their impact on diagnostics, therapeutics, and vaccines.
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世卫组织派出的卫生工作者检测感染埃博拉后获得医治
WHO-deployed health worker receiving care after testing positive for Ebola
WHO is working to ensure an international health worker who is deployed for the Organization in Sierra Leone and has contracted Ebola receives the best care possible including the option of medical evacuation to another care facility if necessary.
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国际卫生工作者是本次埃博拉应对工作的重要组成部分。
International health workers are an important part of this Ebola response.