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The liquid saliva samples highlighted that the Alpha VOC and the WA-1 strain were comparatively more stable than the Beta VOC in winter environments.
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Altogether, the Alpha and Beta VOCs displayed comparable stabilities under all the conditions assessed in liquid sputum. Additionally, the WA-1 strain showed more stability than the Beta VOC under indoor, summer, spring/fall, and winter conditions in liquid sputum. In liquid sputum, the WA-1 strain was more stable than the Alpha VOC in indoor, summer, spring/fall, and winter conditions. Also, compared to the Beta VOC, the Alpha VOC and WA-1 strain were more stable in winter conditions. Notably, there was a considerable difference in the rates of viral decay corresponding to WA-1 and Beta in indoor conditions. Moreover, the Beta VOC was more stable than the Alpha VOC in summer, spring/fall, and indoor conditions. The liquid nasal mucus samples showed that the WA-1 strain was comparatively more stable than the Alpha VOC in summer, indoor, and spring/fall environments. The Omicron VOC showed 31 amino acid substitutions, three insertions, and six deletions in the spike protein, along with various deletions and substitutions in other structural proteins compared to the QA-1 strain. The consensus nucleotide sequence in the Omicron stock was 100% identical to the reference sequence. Furthermore, two additional substitutions were observed in the viral stock of the Beta VOC in comparison to the reference sequence. The viral stock derived from the Beta VOC was homologous with the reference sequence and comprised various amino acid substitutions within the spike protein compared to the WA-1 strain. Intranasally delivered neutralizing antibody protects against SARS-CoV-2 Omicron and Delta variants.What is the risk of BA.5 infection among persons with documented infection with past variants?.Scientists develop a novel solution to evaluate airborne transmission of SARS-CoV-2.The team also observed an amino acid substitution at position three from aspartic acid to leucine of the SARS-CoV-2 nucleocapsid protein. Additionally, viral stock corresponding to the Alpha VOC was 100% homologous to the reference sequence and displayed various amino acid substitutions in the spike protein as compared to the WA-1 strain. The study results highlighted that the consequence sequence derived from the SARS-CoV-2 WA-1 strain was completely identical to the reference sequence from the GISAID database apart from one synonymous mutation noted at position 1912 from C to T. The consensus sequences were further extracted for each individual variant from the read mappings, which were then aligned with sequences published in the Global Initiative on Sharing All Influenza Data (GISAID) database to inspect the identified mutations manually. This was followed by an analysis using the low-frequency variant detector program to assess non-synchronous substitutions.
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Viral stock titers were subsequently estimated via end-point titration.įurthermore, the team assessed the amino acid substitutions in SARS-CoV-2 Alpha and Beta VOCs by mapping sequencing reads per the WA-1 consensus sequence. Four distinct SARS-CoV-2 variants were used in the study: (1) USA-WA/2020 (WA-1): isolated from the COVID-19 patient identified in the US in January 2020, (2) human CoV (hCoV)-19/England/204820464/2020 (Alpha VOC): isolated in the UK in November 2020, (3) hCoV-19/South Africa/KRISPK005325/2020 (Beta VOC): isolated in South Africa in November 2020, and (4) hCoV-19/USA/NY-MSHSPSP-PV44476/2021 (Omicron VOC): isolated in New York in November 2021.
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The team cultured Vero E6-transmembrane serine protease 2 ( TMPRSS2) cells in Dulbecco’s Modified Eagle Medium (DMEM). In the present study, researchers investigated and compared the stabilities of SARS-CoV-2 VOCs and the ancestral lineage in biological fluids. However, extensive research is required to understand the stability of these VOCs in human biological fluids. Since the beginning of the coronavirus disease 2019 (COVID-19) pandemic, SARS-CoV-2 has evolved into novel variants of concern (VOCs) which display increased transmissibility, infectivity, and fitness. The SARS-CoV-2 virus is majorly transmitted from infected individuals via respiratory droplets, while virus-laden excretions can potentially be a source of infection. Study: Ancestral lineage of SARS-CoV-2 is more stable in human biological fluids than Alpha, Beta and Omicron variants of concern. In a recent study posted to the bioRxiv* preprint server, researchers assessed the stability of ancestral severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) lineage in human biological fluids. Tf2 promotional items hack.By Bhavana Kunkalikar Reviewed by Aimee Molineux