Graph and Table of Infectious Diseases

Br Med J 1965; 2 doi: https://doi.org/10.1136/bmj.2.5463.710 (Published 18 September 1965) Cite this as: Br Med J 1965;2:710

This is a PDF-only article. The first page of the PDF of this article appears below.

PDF extract preview

Sign in

Log in through your institution