While most state and all federal health officials decided to wait until November before trying to assay the effectiveness of polio vaccination in 1956, Oregon's board of health got a jump on them last week by reporting its program a huge success. Among 350,000 Oregonians who have received at least one shot of Salk vaccine, there have been only 30 cases of polio in 1955 and 1956 to date, for a rate of less than 9 per 100,000. Among 1,340,000 unvaccinated there have been 480 cases, for a rate four times as high—36 per...
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