Within a few months after I arrived in Pittsburgh, I was visited by the director of research of the National Foundation for Infantile Paralysis, asking if I would be willing to participate in a program on typing polio viruses. I’d had no experience in working with polio, but this provided me with an opportunity, just as the work on influenza did. So I seized upon that opportunity. It gave me a chance to get funds, to get laboratory facilities, to get equipment, to hire staff, and to build up something that was not there. It also would provide me with an opportunity to learn about how you work with the polio virus.