Health Minister Robert Turton announced that Britain has developed a modified Salk vaccine, which will be available this year for 250,000 to 500,000 children aged two to nine. Main difference from the U.S. anti-polio vaccine: substitution of the milder Brunhilde strain of Type I virus for the more virulent Mahoney strain, on the ground that if any live virus slips through, Brunhilde is less likely to cause serious paralysis.
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