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There are certain criteria for the identification of an unknown strain of virus as one of endemic typhus or spotted fever.
Satisfactory cross-immunity tests must be obtained before one can state definitely whether or not an unknown virus is one of spotted fever or typhus. In performing cross-immunity tests precautions must be taken to rule out secondary infections and non-specific immunity.
1 Paper presented at the 28th Annual Meeting of the American Society of Tropical Medicine, Birmingham, Alabama, November 1618, 1932.
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