1900-1969 (69 years old)
Year of great discovery/work
Francis was the first person to isolate influenza virus and to discover there was more than one type of influenza. Francis conducted research in the fields of virology and epidemiology, figuring out how viruses spread. Later, Francis designed the famous study that determined that Salk’s polio vaccine was safe and effective.
Did you know?
Francis was Jonas Salk’s mentor.