JAMA. 1906;XLVII(1):42. doi:10.1001/jama.1906.02520010050010.
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Dr. Ricketts' report in this issue of The Journal of his recent work on the pernicious disease in the Bitter Root Valley of Montana, known as "Rocky Mountain Fever," shows that a definite step in advance has been made by the demonstration that the disease is communicable to guinea-pigs and monkeys on inoculation of the blood of patients. The cause of this disease, whatever that may be, consequently occurs in the blood. The failure to confirm the observation reported by Wilson and Chowning of the occurrence of a piroplasma in the blood either of patients or of animals with the inoculated disease is also noteworthy. Now, that the disease has been shown to be transmissible to animals, it is a matter for hope that a way may be found to perpetuate the inoculated disease in order to obtain better opportunity to search for the causative agent than is afforded at


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