Gingrich R E
J Parasitol. 1979 Apr;65(2):288-92.
Two levels of 3 factors, (1) host age, (2) host dietary state in regard to vitamin A, and (3) previous infestation history, were tested individually and in combinations for their effects on the susceptibility of Peromyscus leucopus to infestation by larvae of the rodent bot fly, Cuterebra fontinella. Previous infestation was the only significant single factor. Previously uninfested (Pu) mice usually were more susceptible to infestation than previously infested (Pi) mice. Interactions of age and state of vitamin A had the following effects: 1) Young Pu mice that had been denied vitamin A were much less susceptible to infestation than equivalent mice that had been fed diets containing the vitamin; and 2) when Pu mice were deficient in vitamin A, old mice were more susceptible than young mice but when Pu mice were not deficient in the vitamin, young mice were more susceptible. These findings may have significance for natural infestations of P. leucopus.
对三个因素的两个水平进行了测试，这三个因素分别是：（1）宿主年龄，（2）宿主关于维生素A的饮食状态，以及（3）先前的感染史，测试了它们各自以及组合起来对白足鼠（Peromyscus leucopus）受鼠蝇（Cuterebra fontinella）幼虫感染的易感性的影响。先前的感染是唯一显著的单一因素。先前未感染（Pu）的小鼠通常比先前感染（Pi）的小鼠更容易受到感染。年龄和维生素A状态的相互作用有以下影响：1）被剥夺维生素A的年轻Pu小鼠比喂食含该维生素饮食的同等小鼠更不易受到感染；2）当Pu小鼠缺乏维生素A时，老年小鼠比年轻小鼠更易感染，但当Pu小鼠不缺乏该维生素时，年轻小鼠更易感染。这些发现可能对白足鼠的自然感染具有重要意义。
