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the well vaccinated would be found to be less. The age distribution of the cases was then examined, division into the three first quinquenniads of life being made, the result being that both the gross numbers in each age group and the totals of the two subdivisions were found to increase in the same progression with. the age, this being roughly as 1: 4 : 8. (It was incidentally remarked that this ratio showed the greater protection afforded under five years than over.) After drawing attentiondoi:10.1016/s0140-6736(02)13698-1 fatcat:ioxcx6ocyvfxjk5arrmxd5pf4q