. Medical diagnosis for the student and practitioner. reports an uncultivable Agent.—Dermacentroxenus rickettsi is a minute, intracellular,bacterium-like microorganism which does not stain by Grams method andis best demonstrated with the Giemsa stain. It appears usually as lanceo-lates in pairs, about one micron in length. The organism is non-filtrable, isreadily killed by most disinfectants as well as by heat and drying. It isuncultivable. Symptoms.—After an incubation period of from three to ten days, head-ache, nausea, muscular soreness, a chill or chilliness, and nose-ble
. Medical diagnosis for the student and practitioner. reports an uncultivable Agent.—Dermacentroxenus rickettsi is a minute, intracellular,bacterium-like microorganism which does not stain by Grams method andis best demonstrated with the Giemsa stain. It appears usually as lanceo-lates in pairs, about one micron in length. The organism is non-filtrable, isreadily killed by most disinfectants as well as by heat and drying. It isuncultivable. Symptoms.—After an incubation period of from three to ten days, head-ache, nausea, muscular soreness, a chill or chilliness, and nose-bleed, arefollowed by a rapidly rising fever and an accelerated pulse and rash appears from the third to the seventh day, first on the foreheadand extremities, later on the chest, abdomen, and back. It is macular, brightred, and becomes petechial in severe cases. It is profuse everywhere excepton the abdomen and desquamation may follow. The exanthem appearsfirst on the ankles, wrists and back, the abdomen being least affected. Later. -Rocky Mountainspotted fever.—Exanthem.(After J. F. Anderson). Rash Profoundasthenia. 1056 MEDICAL DIAGNOSIS Contrastin mortality. the visible mucous membranes may be involved and even the palms of thehands and soles of the feet. With the establishment of the hemorrhagic character of the rash, areasof confluence may occur and necrotic spots may develop in the dependentareas. Desquamation follows but usually is not extensive. The character of the exanthem and the tendency to necrosis directlycorresponds to the changes found at autopsy in the peripheral blood fatal cases rapid anemia appears with sustained high temperature anda rapid weak pulse. Albuminuria is constant. The spleen is enlarged. Differential Diagnosis.—No confusion can arise if the salient points arerecalled. The history of exposure, the tick bites, the discovery of the tickitself, the sporadic nature of the disease, its distribution, the character andti
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectdiagnos, bookyear1922
