Undulant fever is generally considered to be a prolonged recurring disease. Marston,1 in 1881, reported the average duration to be from three to ten weeks, but recognized a form that he described as so mild that the patient may never be confined to bed and all the while may be supposed to be laboring under a peculiar form of dyspepsia. He gave as diagnostic points in mild types of undulant fever: (1) gastric derangement that refuses to yield to any treatment; (2) great depression of the spirits out of all proportion to the symptoms; (3) slight pyrexial attacks, and (4) anemia, slow and progressive, with a marked tendency to an attack of rheumatism or neuralgia. In describing his own symptoms he probably described one of the earliest ambulatory cases.
Hughes,2 in his classic monograph published in 1897, disregarded doubtful and nonfatal cases of less than three weeks' duration.
LEAVELL HR, AMOSS HL. BRUCELLA INFECTION OF BRIEF DURATION: REPORT OF A CASE. Arch Intern Med (Chic). 1931;48(6):1186–1191. doi:10.1001/archinte.1931.00150070124008
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