Research Article Success and failure in human virus disease. IV. Immunization. Br Med J 1971; 1 doi: https://doi.org/10.1136/bmj.1.5746.446 (Published 20 February 1971) Cite this as: Br Med J 1971;1:446 Article Related content Metrics Responses Peer review This is a PDF-only article. The first page of the PDF of this article appears below.