Complement-Fixation Tests on Serums of Cattle Harboring Trypanosoma Americanum

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  • Pathological Division, Bureau of Animal Industry, Washington, D. C.


Seventeen out of 26 normal adult cattle were found by cultural tests to be harboring Trypanosoma americanum, a nonpathogenic trypanosome. The serums of these animals when subjected to the complement-fixation test for trypanosomiasis all gave negative results to the test.

From the preceding work it can be concluded that cattle harboring a non-pathogenic trypanosome do not produce antibodies detectable by complement fixation for a pathogenic trypanosome.