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Author Spotlight: A Pseudotype Virus System for Assessing Omicron Subvariants and Neutralizing Antibodies in SARS-CoV-2 Research
Published on: September 8, 2023
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BF.7: a new Omicron subvariant characterized by rapid transmission
Xiaoyu Gao1, Furong Wang2, Huizhao Liu3
1Inner Mongolia People's Hospital NHC Key Laboratory of Diagnosis & Treatment of COPD/Inner Mongolia Key Laboratory of Respiratory Diseases, Inner Mongolia Autonomous Region Hohhot, China; Inner Mongolia People's Hospital Inner Mongolia Academy of Medical Sciences, Inner Mongolia Autonomous Region Hohhot, China.
Summary
The Omicron BF.7 sublineage shows higher transmission than previous SARS-CoV-2 variants. COVID-19 vaccination, especially with three doses, significantly reduces severe symptoms and abnormal inflammatory markers associated with BF.7 infection.
Area of Science:
- Virology
- Epidemiology
- Immunology
Background:
- The Omicron BF.7 (BA.5.2.1.7) sublineage is a novel variant of SARS-CoV-2.
- Its clinical characteristics and transmission dynamics require thorough investigation.
Purpose of the Study:
- To establish the clinical characteristics of the BF.7 sublineage.
- To estimate the transmission rate of BF.7.
- To assess the impact of COVID-19 vaccination on BF.7 infection outcomes.
Main Methods:
- Clinical data from 421 patients infected with BF.7 in Hohhot, China (September 28–October 3, 2022) were analyzed.
- The basic reproduction number (R0) was estimated using statistical modeling.
- Outcomes were compared across different vaccination statuses (0, 1, 2, or 3 doses).
Main Results:
- The estimated R0 for BF.7 was 13.79, indicating high transmissibility.
- The majority of infections were mild (82.42%) or asymptomatic (12.35%). Common symptoms included fever and cough.
- Three-dose vaccination was associated with significantly lower rates of fever and abnormal C-reactive protein levels compared to one or two doses.
- No severe or critical cases were observed in fully vaccinated individuals (3 doses).
Conclusions:
- BF.7 demonstrates increased transmissibility compared to earlier SARS-CoV-2 variants.
- COVID-19 vaccination, particularly a three-dose regimen, is effective in mitigating severe illness and reducing key inflammatory markers in BF.7 infections.
- Vaccination also helps alleviate symptoms like fever, nausea, and vomiting.
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