Abstract
Summary
Bacteriophages were isolated from 11 of 60 samples of live virus vaccines for human use. One of the phages isolated gave similar plaques and had similar morphologic characteristics to the phage found most frequently in fetal bovine serum.
We appreciate the support and encouragement given to us by R. L. Kirschstein, B. L. Elisberg, H. E. Hopps, and H. M. Meyer, Jr.
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