In a previous communication1 I have said that most carriers of typhoid bacilli have a persistent positive Widal agglutination reaction and suggested that this fact should be taken advantage of to trace the source, and if possible anticipate a typhoid epidemic. By this means in Worcester, in 1910, one carrier was discovered who initiated an epidemic of 213 cases of typhoid, and in 1909, the probable source of two other smaller epidemics was brought to light. To show the efficiency of this procedure the cases of two more typhoid carriers are now briefly reported from our 1911 experience.
1. Between August 1 and September 27, five cases of typhoid were reported to the board of health on one milk route. The dairyman, the producer of about 60 quarts of milk daily, was also his own distributor. Specimens of blood were obtained from all persons on the dairy farm. One
BIGELOW EB. THE VALUE OF THE WIDAL REACTION IN THE DETECTION OF TYPHOID CARRIERS. JAMA. 1912;LVIII(18):1339. doi:10.1001/jama.1912.04260050015004
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