First COVID vaccine doses to initially go to most at-risk healthcare workers once it arrives in La Crosse December 15, 2020 6:31 PM Tyler Job Updated: As for La Crosse? That remains unclear. “It’s about a marathon,” Gundersen Health System infectious control specialist Bridget Pfaff said. But both Gundersen and Mayo Clinic health systems know which types of healthcare workers will be getting the vaccine first when it does arrive. “We’re going to start with staff who are directly on the front lines,” Pfaff said. “It will be going first to the people who are at the highest risk, and working in in-patient units and respiratory clinics,” Mayo Clinic Health System Dr. Erin Morcomb said.