This chick embryo tissue culture vaccine, de-veloped in the laboratory of Dr. John Enders, has been given to approximately z0 persons in the United States, either alone or in combination with gamma globulin. A single dose induces active immunity and gives the recipients a mild or inapparent, noncommunicable measles infection. In the majority of recipients the symptoms are minimal, but 30-40 per cent have fever of 103° F. (rectal) or higher, beginning about the sixth day and lasting two to five days. Even thos…
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