“Two new variants are competing for dominance: NB.1.8.1 and XFG. We recently nicknamed NB.1.8.1 ‘Nimbus’, and it's pretty clear that XFG deserves a nickname as well. Keeping with the meteorological theme, XFG = ‘Stratus’.

Here's some more info about Nimbus and Stratus. 🧵

“Earlier this month the XFL variant was defined, setting a new benchmark in SARS-CoV-2 evolution: a "quadruple-recombinant", meaning it’s evolution includes 3 recombinant ancestors.

It’s a stark example of how we are giving this virus every opportunity to evolve.

COVID19 #XFL

🧵”