“As expected, Omicron has arrived in suburban Cook County and we must take every possible precaution to prevent this highly-contagious variant from spreading rapidly,” Dr. Rachel Rubin, senior medical officer of Cook County, said in a statement. “Vaccinations, including booster shots, are vital. Masking indoors in all public spaces is mandated in the county and must continue. And we urge unvaccinated residents to not attend any holiday celebrations or social events during this time.”
