The Omicron variant now makes up almost 4% of all infections in Switzerland – but Delta is still dominant with 96% of infections.
The figures from the Federal Health Office are being described as surprising by some members of the Covid Task Force.
2,500 sequencing operations are caried out every week to track the variants – that’s high compared to neighbouring countries.
The rise in the new variant is triggering more urgency to get people boosted with a third jab.