After weeks of hesitation over whether to start a small test program with Salk polio vaccine and a few thousand volunteers, Britain's health authorities made up their minds last week. They canceled the whole thing as too dangerous. Said Dr. Graham Selby Wilson, director of the Public Health Laboratory Service: "I do not see how any vaccine prepared by [Dr. Jonas] Salk's method can be guaranteed to be safe."
Though Dr. Wilson slammed the door, he did not bolt it. "We are hoping," he went on, "to modify the Salk vaccine in such a way that the highly virulent strains of which...
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