During the past few years particular attention has been directed toward methods for the prevention of measles.1 The need of satisfactory measures for accomplishing this purpose is frequently of vital importance, especially in children's hospitals or in the pediatric wards of general hospitals. When severely ill patients contract measles, any doubts pertaining to their recovery are multiplied.
Under any circumstances, measles is not merely a serious disease because of its possible complications, but one in which the mortality may be high, as shown by hospital reports.2 Consequently, the advantage of providing immediate protection for an invalid child cannot be emphasized too strongly. One of us3 (A. L. H.) has demonstrated the value of immune goat serum for purposes of this kind. Human convalescent measles serum should, no doubt, be equally effective, but a supply of this is not easily available, whereas, the possibility of producing immune goat