Japanese Journal of Veterinary Research;Volume 11, Number 4

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ANTITOXOPLASMIC EFFECT OF IMMUNE SWINE SERUM REVEALED IN THE CULTURE OF SWINE LEUKOCYTES

YANAGAWA, Ryo;HIRATO, Katsushichi

Permalink : http://hdl.handle.net/2115/1784
JaLCDOI : 10.14943/jjvr.11.4.135

Abstract

Samples of buffy coat obtained from pigs actively immunized with Toxoplasma gondii and from a normal pig were cultivated separately in immune and normal swine sera, and the multiplication of toxoplasms in these cultures was studied. In the presence of immune serum, multiplication of toxoplasms was inhibited. The inhibition by immune serum was observed in the cultures of leukocytes derived from both immunized and normal pigs. On the contrary, in the presence of normal serum, toxoplasms multiplied abundantly in the cultures of leukocytes derived from immunized and normal pigs. These findings suggest that circulating immune substances will play a leading role in immunity against toxoplasmosis. The antitoxoplasmic effect of immune serum hardly reached to toxoplasms which had previously penetrated inside leukocytes. The antitoxoplasmic effect shown in the present study proved to be heat-stable, thus was considered different from the neutralizing antibody reported by SABIN and OLITZKY. However, the difference between the two is not yet elucidated.

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