Publication of this paper has been withheld by the writer in order that the animal reactions of the new world monkeys might be worked out, and also that further attempts to produce a polyvalent hyperimmune serum might be made, but it is thought that the paper should now be published as it is, as the production of an immune serum can be much better accomplished near a constant and larger supply of laboratory animals.
As Novy,1 Mackie2 and others,3 in part, have pointed out, it is possible with the means at present at our disposal to separate the spirochetes causing relapsing fever into four groups, the separation being based on animal reactions, specific characters, such as agglutination and immunity, and certain clinical features of the infection in man.This paper deals chiefly with some of the characters of the spirochete causing the relapsing
DARLING ST. THE RELAPSING FEVER OF PANAMA. Arch Intern Med (Chic). 1909;IV(2):150–185. doi:10.1001/archinte.1909.00050180052005
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