My assignment is to report on the papers given earlier on the problems of production and biologic control of measles vaccine.
Since I have been quite intimately concerned with the problem of poliomyelitis vaccine for several years, and since I am new to many aspects of measles vaccines, it is perhaps natural that what has struck me most forcibly is the similarity of the problems of measles vaccine to those of poliomyelitis vaccine, with which most of you are familiar. But it makes me wonder what will be the subject of the next conference of this kind. Hepatitis, perhaps? And after that, what? Rubella? The progress is so rapid, and such a fund of basic knowledge has been acquired since Enders, Weller, and Robbins made their great discovery of tissue culture techniques and cytopathogenesis, it can be only a matter of a short time before these other uncontrollable diseases are