Penev P, Stefanova M
Vet Med Nauki. 1975;12(5):111-5.
Studied was the immunizing capacity of Eimeria tenella oocysts, treated with gamma rays at the rate of 6000 R, in 10- and 20-day-old chickens. The oocysts sporulated after treatment. Applied at the rate of 50,000 R they showed lower virulence and were capable of inducing resistance to reinfection with nonirradiated oocysts at rates that were three times as much. Following reinfection some birds manifested subclinical coccidiosis but survived. This showed that the immunization with oocysts that had been irradiated with 6,000 R had its peculiar aspects.
研究了经6000拉德γ射线处理的柔嫩艾美耳球虫卵囊对10日龄和20日龄雏鸡的免疫能力。处理后的卵囊形成了孢子。以50000拉德的剂量应用时，它们显示出较低的毒力，并且能够诱导对三倍剂量未辐照卵囊再感染的抵抗力。再次感染后，一些鸡表现出亚临床球虫病但存活了下来。这表明用6000拉德辐照的卵囊进行免疫有其独特之处。
