![Sample our Health and Social Care journals, sign in here to start your FREE access for 14 days]({"type":"image" , "src" : "/sda/5938/TOC-Subject-Sample-2021-Health-Social-Care.jpg"})
Abstract
Serologic evidence is presented which indicates that Hong Kong influenza virus represents an example of discontinuous antigenic variation. In addition, evidence is presented that suggests that both A2 and Hong Kong viruses had a past period of prevalence in the period from 1890 to the early 1900’s.