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CORRIGENDUM Vol. 56, No. 4 A controlled field trial of plain and aluminium hydroxide-adsorbed cholera vaccines in Surabaya, Indonesia, during 1973-75 Page 619, right-hand column, lines 4-11 should read: Cholera vaccine adsorbed to aluminium hy- droxide was studied by Jo6 et al. (4,5) and was shown to possess greater potency than conven- tional vaccines in the active mouse protection test developed by Feeley & Pittman (6). Jo6 et al. also demonstrated appreciable antibody pro- duction in young adult volunteers after paren- teral injection of the adjuvant vaccine in two doses 2 weeks apart. - 995 -