BRoH between 20% and 30%. While the present report was in progress another was published (Frazer, 1948) which is salutary to all who had been achieving rates of about 10%, for in Belfast the commendably low figure of under 3% was reached. So far as can be ascertained the criteria of infection used by each observer were similar to those employed at Cambridge.
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G. Martyn (1949) studied this question.