Publication of Article Swiss Medical Weekly, 10.12.2021, PCR performance in the SARS-CoV-2 Omicron variant of concern?
https://smw.ch/article/doi/smw.2021.w30120

Recommendations of CCCM-SSM SARS-CoV-2 diagnostics working group on indications and limitations of the SARS-CoV-2 PCR testing from saliva. 
Latest version  

Recommendations for testing using the N501Y PCR

SSM Variant attention paper Lab and manufacturer