Abstract

An autoradiographic study was conducted to determine the influence of the intracellular coccidian parasite of chickens, Eimeria tenella, on the incorporation of tritium-labeled thymidine in kidney cell cultures. Evidence was obtained for a parasite-induced increase in thymidine incorporation in host cell cultures which is too great to be attributed to unscheduled DNA synthesis. The stimulatory effect became significant ( P < 0.05) at 24 hr after inoculation and further increased at 48 and 72 hr postinoculation. Both parasitized and unparasitized cells in the infected cultures showed similar increases in thymidine incorporation. Furthermore, the increased incorporation of thymidine in the infected cultures was found to be independent of both the percentage of parasitized cells and development of the parasite.

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