so das Ergebnis einer schwedischen Studie.

...

Monitoring of the SARS-CoV-2 Omicron BA.1/BA.2 variant transition in the Swedish population reveals higher viral quantity in BA.2 cases | medRxiv

medRxiv - The Preprint Server for Health Sciences
https://www.medrxiv.org/content/10.1101/2022.03.26.22272984v1