Matthew Zahn, M.D. is medical director of the Division of Epidemiology and Assessment for the Orange County Health Care Agency. He answers questions here about one of the first patients confirmed to have the novel coronavirus, diagnosed, with what is now known as Covid-19, in Orange County, Ca. in January. Dr. Zahn currently serves on NACCHO’s Infectious Disease Workgroup, and is the liaison from NACCHO to the CDC’s Advisory Committee on Immunization Practices. He has served on multiple national public health committees, including CDC’s school-located vaccination advisory committee, and as president of the California Association of Communicable Disease Controllers. His primary work is in public health, but he continues to practice as a pediatric infectious disease physician.