Stoimenov K
Vet Med Nauki. 1979;16(5):10-7.
Experiments including single, two-fold and triple superinvasions with 100 invasive heterakidic eggs each on 2 day- and 4 month-old chickens were carried out (beginning of the experiment). Single superinvasions were effected on the 12th, 18th and 30th day, two-fold superinvasions -- on the 12th and 18th, 12th and 30th, 18th and 30th day, while triple superinvasions took place on the 12th, 18th and 30th day. It was established that the superinvasions of 20 day-old chickens reduce 3.6 times the survival of heterakids. The reduction was most pronounced in chickens superinvaded on the 18th day. A certain areactivity was observed in 4 month-old superinvaded chickens: the number of surviving heterakids was 1.4 times greater in superinvaded chickens than in the control. A significant shortening of heterakid length was established in younger experimental chickens as compared to the control, as well as an enhanced pathogenic effect of the helminths. Deviations of this kind were not evident in older chickens.
进行了多项实验，包括对2日龄和4月龄雏鸡分别进行单次、两次和三次超感染，每次超感染接种100个侵袭性异刺线虫卵（实验开始时）。单次超感染分别在第12天、第18天和第30天进行，两次超感染在第12天和第18天、第12天和第30天、第18天和第30天进行，而三次超感染在第12天、第18天和第30天进行。结果表明，对20日龄雏鸡进行超感染会使异刺线虫的存活率降低3.6倍。这种降低在第18天进行超感染的雏鸡中最为明显。在4月龄超感染雏鸡中观察到一定的反应性增强：超感染雏鸡中存活的异刺线虫数量比对照组多1.4倍。与对照组相比，较年轻的实验雏鸡体内异刺线虫的长度明显缩短，同时蠕虫的致病作用增强。在较年长的雏鸡中未观察到此类偏差。
