COVID ‘variant soup’ is making winter surges hard to predict

Descendants of Omicron are proliferating worldwide — and the same mutations are coming up again and again.
Some call it a swarm of variants — others refer to it as variant soup. Whatever it’s called, the current crop of immunity-dodging offshoots of the Omicron variant of SARS-CoV-2 is unprecedented in its diversity. This complexity makes it harder to predict coming waves of infection. It might even lead to a ‘double wave’ in some places, as first one variant and then another overtakes a population.