Just one month ago, Iowa experienced its worst Covid-19 surge yet. Coronavirus cases began soaring there in early November, as they have throughout the United States. By the middle of the month, Iowa was recording about 4,000 new cases every day. But this week, staff at a University of Iowa Health Care system finally had reason to celebrate. The first doses of Pfizer’s vaccine arrived at the Iowa City location Monday morning, in tiny vials packed in dry ice. Angelica Lavito spoke to healthcare workers there just after they became some of the first Americans outside of clinical trials to get immunized against the deadly disease.