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Much joint research by bacteriologists and entomologists had to be done at the Rocky Mountain Laboratory on ticks and guinea pigs before a successful vaccine against spotted fever was developed. The results of the Spencer-Parker vaccine were impressive. Before vaccination began in the spring of 1925, the mortality from spotted fever in the Bitter Root Valley had ranged between 80 and 90 percent. Between 1927 and 1940 half a million people in the Rocky Mountain region were vaccinated. Of these, only 61 developed spotted fever and only three died.
c. 1935
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