Studies on the Potency of Prophylactic Vaccines. 1. Cholera Vaccine

f B. M. PAUL 'o,n the Cholera Bacteriological Enquiry, Indian esca,ch Fund Association, School of Tropical Medicine, Calcutta) Cholera vaccine is extensively used foi Prophylaxis, particularly during epidemics of cholera and in endemic areas of the disease. 1 here are three main sources of cholera vaccine, vaccines prepared by certain recognized oratories, the vaccines prepared by local commercial firms and a certain amount of vaccines ^ported from abroad. The recorded observajons on cholera vaccines such as those of Taylor, AhuJa and Singh (1936) deal with the keeping Properties of vaccine and the relative value of ' r&ins of vibrios in the preparation of choleia Vaccines. The present paper records the results of the examination of fourteen samples of vac-