Abstract
The development of a reliable model for the adoptive transfer of immunity to coccidiosis (infection with Eimeria vermiformis in NIH mice) is described. More than 10(8) of a mixture of spleen and mesenteric lymph node (MLN) cells, given either intravenously or intraperitoneally, were required to transfer a significant degree of protection. Dividing cells, present in the donors at 10 or 14 days after priming, but not at 5 or 19 days, were shown to be the effectors. When examined separately, MLN cells were found to be superior to spleen cells, and the injection of as few as 5 x 10(7) was capable of substantially reducing the oocyst output from a challenge inoculum. The recipients of cells from primed mice had earlier, and sometimes higher, titres of specific antibodies in the serum but, overall, there was no correlation between these titres and protection. Further characterization of the cells responsible for adoptively transferring immunity to this infection should now be possible.
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