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Show Peril of the Wood Ticks Nullified cine, injected a mixture of ground-up ground-up ticks and weak carbolic acid into his arm, almost everyone who contracted the disease died. Fatalities were so high that natives na-tives of the Bitterroot valley dared not venture into the mountain canyons can-yons where infected ticks lurked on every tree and bush. People who lived in the infected areas abandoned aban-doned their homes to the deadly bugs. Success at Last. Then in 1921, Dr. Spencer, Dr. Parker, an entomologist, and their assistants, Henry Cowan, Bill Gei-tinger Gei-tinger and Elmer Greenup, established estab-lished a laboratory in an old school-house school-house near Hamilton. They began searching for an antidote for the deadly bite. The ticks killed Cowan and Gei-tinger. Gei-tinger. They died, shivering, with temperatures above 103, their skins covered with black spots. But Spencer Spen-cer discovered the immunizing magic mag-ic of a soupy concoction of ground-up ground-up ticks and weak carbolic acid. Today the laboratory has a staff of 125 and produces spotted fever vaccine for most of the United States, Canada and Brazil. The mixture of squashed ticks and carbolic acid has been supplanted by a new vaccine reared in a chicken chick-en egg. Vaccine Now Is Effective Against Mountain Spotted Fever. HAMILTON, MONT. The Rocky mountain wood tick, once a bone-chilling bone-chilling man-killer of the Pacific Northwest, now is almost a tamed bug feared less by people than by sheep and cattle, source of the tick's existence. Dr. R. R. Parker, director of the United States public health service laboratory here, indicated in an article ar-ticle soon to be published in the American Journal of Tropical Medicine Med-icine that 15 years' use of vaccine against spotted fever had proved vaccination 91.89 per cent preventive. pre-ventive. In 1915, the Rocky mountain wood tick killed more than 500 persons in Montana, Wyoming, Idaho and Oregon. In 1939, fewer than 100 died of tick bites. Most Virulent. In the western Montana area most' virulent in the world, according accord-ing to Dr. Parker of those who contracted the disease between 1925 and 1939, three of the 37 who had been vaccinated died, while 42 of the 51 persons who had not been protected succumbed. Dr. Parker's statistics showed deaths from spotted fever in the Pacific Northwest since 1935 have decreased almost in direct proportion propor-tion to liters of vaccine used. Cost of the serum for one person once was $20. Today it is $1. Before May 10, 1924, when Dr. R. R. Spencer, who pioneered tick vac- |