. Diseases of infancy and childhood . —The investigations. c. Fig. 213.—Stagfes in WidalEeaction. (Aft- r Kobin. \ This method is described by the New York Health Department. TYPHOID FEVER. G51 of Griiber, Widal, and others, published in 189G, showed that tlic bloodof persons, suttering from or having recently had typhoid fever, contains,as a rule, after the fifth day of the disease, substances which, when addedto a broth culture of the typhoid bacilli, arrest the characteristic move-ments of these organisms and cause them to become clumped together inmasses. The results of a very large number
. Diseases of infancy and childhood . —The investigations. c. Fig. 213.—Stagfes in WidalEeaction. (Aft- r Kobin. \ This method is described by the New York Health Department. TYPHOID FEVER. G51 of Griiber, Widal, and others, published in 189G, showed that tlic bloodof persons, suttering from or having recently had typhoid fever, contains,as a rule, after the fifth day of the disease, substances which, when addedto a broth culture of the typhoid bacilli, arrest the characteristic move-ments of these organisms and cause them to become clumped together inmasses. The results of a very large number of examiuations made here in XewYork and elsewhere show, that if the blood contains agglutinating sub-stances in sufficient amount to cause a prompt and marked reaction, whenone part of serum or blood solution is added to 10 parts of a broth cultureof the typhoid bacillus, the presence of a previous or existing typhoid in-fection may be considered as extremely probable, and that if these sub-stances are present in such an amount as promptly to produce
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