Here an news-article, which exposes how ridiculous the government-mandate is. Also the vaccinated health-care-workers got Covid:
Dr Gerrard said some of the cases detected had been healthcare workers.
“There have been some cases in the healthcare setting because we are aware that the virus is widespread,” he said.
“It is inevitable that people in the healthcare setting will develop infection and that is going to happen more and more in the coming weeks and months.
All of our healthcare workers are vaccinated and all of our healthcare workers wear masks when in the clinical environment, so the risk to patients is minimised but it does emphasise the need for all of us to get vaccinated.”
https://www.abc.net.au/news/2021-12-18/qld-coronavirus-covid-toowoomba-hospital-worker/100711034
Most of the 43 COVID-19 cases caused by the Omicron variant identified in the United States so far were in people who were fully vaccinated, and a third of them had received a booster dose, according to a U.S. report published on Friday.
https://www.reuters.com/world/us/most-reported-us-omicron-cases-have-hit-fully-vaccinated-cdc-2021-12-10/