Here's the latest variant picture for the recently-designated BA.2.3.20 lineage, nickname "Basilisk".
It has been rising sharply in Singapore, over 5% of recent samples.
It has also been reported in some other countries, but at frequencies below 1%.
The BA.2.3.20 categorisation has yet to roll out to the GISAID database, so I'm approximating it here by searching for samples with the characteristic BA.2.3.20 mutations - NSP2 T547I and NSP3 I896T (h/t @Cornelius Roemer).
That method is currently catching around 60 sequences.
For Singapore, BA.2.3.20 has a growth advantage of 8% per day over all BA.5.* lineages, which predicts a crossover in early October.
The clustering of points along the trend line is a bit loose, so lower confidence in that prediction.
However for Singapore, BA.2.3.20 has a growth advantage of under 1% per day over all BA.2.75.* lineages (nickname "Centaurus" plus child lineages).
BA.2.75.* is now the dominant grouping in Singapore.
Here's the high-level variant picture for Singapore. BA.2.75.* lineages recently took over dominance from BA.5.* lineages.
The BA.2.3.30 lineages above are included in the BA.2.* grouping, which recently began growing as well.
Cases had been falling steadily in Singapore, but that trend reversed in early September, and they climbed again to a rate of around 40/100K daily cases.
That change coincided with the rise in frequency of BA.2.75.* and BA.2.* to around 20-40%.
Today I discovered an extraordinary microlineage of BA.2.3. What makes it extraordinary? A colossal genetic saltation (10 spike mutations) combined with striking geographic spread for a very small number of sequences (just 4 so far). 1/25 github.com/cov-lineages/p…