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DENVER (KDVR) — Denver Mayor Michael Hancock said Saturday he has tested positive for COVID-19.

“I’ve tested positive for Covid and I am now quarantining with mild symptoms. Please, if you haven’t been vaccinated, get vaccinated. If you are vaccinated, make sure you get the booster. It’s making a big difference in my case,” he said in a tweet.

Data from the Colorado Department of Public Health and Environment shows that omicron has become the overwhelmingly dominant variant in Colorado in a matter of weeks.

According to state sequencing data, omicron now accounts for 91.18% of cases in the state, with delta accounting for the rest.