What You Need to Know About the COVID-19 Vaccines in Colorado The much-anticipated COVID-19 vaccines are now being administered throughout Colorado, but questions about their potential side effects and the state's distribution plan remain. We have answers. Victoria Carodine • January 15, 2021 It was only a month ago that the first thousands of doses of the COVID-19 vaccine arrived in the Centennial State. Since that “absolutely historic” day, more than 223,000 Coloradans have already received the Pfizer and Moderna vaccines—and many are already onto their second dose (or booster shot) of the vaccination. While the vaccines have undoubtedly brought hope that the end of the pandemic and a return to normalcy is coming, there’s been confusion on how the distribution process will roll out locally. Some Coloradans are also still concerned about possible side effects. As Colorado moves into phase 1B of the distribution plan, we spoke to Dr. Richard Zane, chief innovation officer for UCHealth and chair of emergency medicine at the University of Colorado School of Medicine, to understand more about how the vaccines work and when Coloradans can expect to receive them.