approach to relative immunity ; but here the question of treatment comes in, as it does in regard to diph¬ theria, which has also been thought to have indepen¬ dently" become less virulent. 12 The resistance of individuals and races is obviously influenced by environment, such as overcrowding, overwork, bad food and alcoholism, and thus both the incidence and the severity of the disease-condi¬ tions which must
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