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The two-story empty school building in Hamilton, Montana, which in 1922 became the U.S. Public Health Service Laboratory for research on Rocky Mountain spotted fever. Here bacteriologist Roscoe R. Spencer (1888-1982) of the Hygienic Laboratory and Montana entomologist, Ralph R. Parker (1888-1949), worked through the summer tick seasons of 1922 to 1928 developing a vaccine. Dr. Spencer gave himself the first human vaccination against spotted fever in 1924.
c. 1925
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