JAMA. 1905;XLIV(8):631. doi:10.1001/jama.1905.02500350041006.
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The reliance which the profession in general places on the Widal reaction is shown by the fact that in many states the country practitioner is able to have blood from suspected cases tested by a state laboratory, and frequently avails himself of this opportunity. In many large cities a similar condition exists. In the case of the country practitioner, the distance from the laboratory frequently entails a considerable loss of time before a report is received. It is obvious, too, that under certain other conditions, such as those which prevail on shipboard, or with an army in the field, the ordinary method of making the Widal test will not avail. It will be remembered that in the early history of the Widal reaction it was proposed to make the test a macroscopic one, but this form of the reaction, though perfectly feasible, was subsequently abandoned because the microscopic test was


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