Studies on Echinococcus granulosus. IV. Detection of Echinococcus Antibodies in Naturally Infected Mississippi Swine

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Abstract
Serologic studies on sera from native Mississippi swine with hydatid cysts have shown that Echinococcus antibody can be detected by the indirect hemagglutination test, the complement fixation test, and the precipitin test. The indirect hemagglutination test was more sensitive (76.5% of 64 sera) than the precipitin (47.2% of 64 sera) or the complement fixation test (3.1% of 64 sera). In testing sera from pigs having cysts of unknown etiology, positive serologic reactions were obtained in 85.7% in the indirect hemagglutination test, in 66.6% in the precipitin test, and in 1.1% in the complement fixation test Sera from pigs with no evident infection gave positive reactions in the indirect hemagglutination test (22.2%) and were negative in the complement fixation test. The significance of positive serologic tests in sera from pigs with cysts of unknown etiology and from pigs with no evident infection is discussed.