Xu Zou Profile picture
Mar 31 3 tweets 1 min read Read on X
A new variant, NB.1.8.1, tops collection 42 with 90% weekly advantage. It quickly grows from 0 to nearly 100% in Hong Kong in the past two months.


NB.1.8.1 is evolved from NB.1. It mimics the spike of XEC on a different backbone(XDV) and adds some more. cov-spectrum.org/collections/42Image
Currently, the fastest XEC branch is XEC.25.1, which has spike S:T22N,F59S from KS.1.1, S:F456L,Q493E from KP.3.3, and S:A435S grabbed after recomb.

NB.1.8.1 follows a different trajectory. It starts from XDV, then gains S:F456L to form XDV.1 \1
Then it gets S:G184S+K478I to form XDV.1.5. After that, it grabs S:T22N+F59S to form NB.1, and gets S:Q493E+A435S for NB.1.8.1. Eventually, it gets all XEC.25.1 pieces(T22N,F59S,A435S,F456L, Q493E) while adding its own G184S and K478I. All independently on an XDV backbone \2

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More from @xz_keg

Oct 16, 2024
New data from CCDC shows XDV.1*,KP.3*,KP.2*,LB.1* and JN.1.67.1* reaches some form of balance in China. Their shares are stable in recent weeks. Image
This interesting balance is reached by every of these major branches have fast-growing sub-branches replacing their parents at similar speeds.
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