Study: Extraordinary Evasion of Neutralizing Antibody Response by Omicron XBB.1.5, CH.1.1 and CA.3.1 Variants. Image Credit: Design_Cells / Shutterstock
The study and findings In the present study, researchers evaluated the spike protein biology of emergent SARS-CoV-2 Omicron subvariants XBB.1.5, CA.3.1, and CH.1.1. First, they assessed the infectivity of spike-pseudotyped lentiviruses in HEK293T-ACE2 cells expressing human angiotensin-converting enzyme 2 and Calu-3 cell line. XBB.1 and XBB.1.5 had higher infectivity, with nearly two-fold increased titers than SARS-CoV-2 D614G in HEK293T-ACE2 cells.
Antibodies eBook Compilation of the top interviews, articles, and news in the last year. Download a free copy Of note, BQ.1.1 showed higher neutralization resistance than any of the XBB subvariants, with 12.8 lower nAb titers than BA.4/5. The CA.3.1 and CH.1.1 subvariants displayed much higher resistance to neutralization by bivalent sera. Next, the neutralization experiments were repeated using sera from HCWs vaccinated thrice with monovalent mRNA vaccines.
Reduced syncytia formation was evident for all subvariants relative to D614G. XBB.1 and XBB.1.5 showed no differences in spike fusogenicity compared to XBB. The efficiency of syncytia formation of CA.3.1 and CH.1.1 was lower than BA.2.75.2. XBB subvariants, BQ.1.1, and BA.2.75.2 exhibited higher spike processing than D614G. There were no differences in spike processing for CA.3.1 and CH.1.1 subvariants relative to the parental BA.2.75.2.
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