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首页> 外文期刊>Journal of Parasitology >Differing susceptibilities of Eimeria acervulina, Eimeria maxima, and Eimeria tenella oocysts to desiccation.
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Differing susceptibilities of Eimeria acervulina, Eimeria maxima, and Eimeria tenella oocysts to desiccation.

机译：艾美球虫，艾美球虫和艾美球虫卵囊对干燥的敏感性不同。

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Outbreaks of avian coccidiosis may occur when susceptible chickens are raised on litter containing viable Eimeria oocysts. The purpose of this study was to compare the relative sensitivities of Eimeria acervulina, Eimeria maxima, and Eimeria tenella oocysts to dessication. Sporulated E. acervulina, E. maxima, or E. tenella oocysts were incorporated into gelatin beads and incubated at 32 C for 0, 1, 2, or 3 days. In vitro oocyst excystation rates were measured for each combination of Eimeria species and incubation time. Day-old broiler chicks were allowed to ingest the oocysts-containing beads, and total oocyst production was measured from days 5-8 post-inoculation. Although no effect on excystation was observed, E. maxima oocysts displayed greater resistance to drying compared to E. acervulina and E. tenella oocysts. Eimeria acervulina oocyst production decreased 100-fold after 1-2 days incubation. Eimeria tenella oocysts were slightly more resistant to drying in that a 100-fold decrease in oocyst production was delayed until 2 days. For both E. acervulina and E. tenella, very few oocysts were observed after 3 days incubation. Eimeria maxima oocyst production remained high at all time points. Subsequent studies revealed E. maxima oocyst production was ablated only after 5 days incubation. These findings may explain in part the observed prevalence of E. maxima in litter from commercial poultry operations.Digital Object Identifier http://dx.doi.org/10.1645/13-192.1
机译：当将易感鸡饲养在含有活艾美球虫卵囊的垫料上时，可能会发生禽球虫病暴发。这项研究的目的是比较针叶艾美球虫，最大艾美球虫和艾美球虫卵囊对干燥的相对敏感性。将孢粉化的大肠埃希菌，大肠埃希氏菌或小肠埃希氏菌卵囊掺入明胶珠中，并在32℃下孵育0、1、2或3天。测量了艾美球虫属物种和孵育时间的每种组合的体外卵囊兴奋率。允许日龄的肉鸡小鸡摄取含卵囊的珠，并从接种后第5-8天测量卵囊的总产量。尽管未观察到对兴奋的影响，但是与小肠埃希菌和小肠埃希氏菌卵囊相比，大肠埃希氏囊对干燥具有更大的抵抗力。温育1-2天后，小球虫艾美球虫卵囊产量降低了100倍。艾美耳球虫卵囊对干燥的抵抗力稍强，因为卵囊产量的下降100倍被推迟到2天。在培养3天后，对于小肠埃希菌和小肠埃希菌，几乎没有卵囊。在所有时间点，最大艾美球虫卵囊产量都很高。随后的研究表明，仅在孵育5天后才消除了最大的卵囊的产生。这些发现可能部分解释了商业家禽操作中在产仔物中观察到的大肠埃希菌的流行。数字对象标识符http://dx.doi.org/10.1645/13-192.1

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