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Estimating Transmission Potential in Gastrointestinal Nematodes (Order: Strongylida)

机译：估计胃肠道线虫的传播潜力（顺序：Strong虫科）

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摘要

Microparasite virulence (the potential to cause harm in the host) is thought to be regulated by a direct trade-off with pathogen transmission potential, but it is unclear whether similar trade-offs occur in macroparasites (helminths). In this analysis, the transmission potentials of 5 nematode species (order Strongylida), known to differ in their virulence, were estimated using an index based on egg production and larval survivability. Virulence estimates were based on the minimum number of worms that cause host death. In nematode species where mature adults cause pathology (trichonematidic development), there is a direct relationship between virulence and transmission, suggesting that high virulence is related to parasite fitness in these worms. However, in nematodes where the juvenile stages produce pathology during migration and development (strongylidic development), virulence is not correlated with transmission. These data suggest that trade-offs between transmission and virulence in nematode parasites are not analogous for all species and may depend on the developmental strategy and mechanism of pathogenicity of the parasites.
机译：人们认为，微寄生物毒力（对宿主造成伤害的可能性）是通过与病原体传播潜能的直接权衡来调节的，但目前尚不清楚在大寄生虫（蠕虫）中是否发生了类似的权衡。在此分析中，使用基于产卵量和幼虫存活率的指数估算了已知5种线虫的致病力（已知的线虫）的传播潜力。估计的毒力是基于引起宿主死亡的蠕虫的最少数量。在成熟成虫引起病理（线虫发育）的线虫物种中，毒力与传播之间存在直接关系，这表明高毒力与这些蠕虫的寄生虫适应性有关。然而，在线虫中，幼年阶段在迁移和发育过程中会产生病理（卵母细胞发育），其毒力与传播无关。这些数据表明，线虫寄生虫的传播与毒力之间的权衡并非对所有物种都类似，并且可能取决于寄生虫的致病性的发展策略和机理。

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    《Journal of Parasitology》 |2001年第2期|p.00000442-00000445|共4页
  • 作者

    D. L. Medicaa and M. V K. Sukhdeob;

  • 作者单位

    aDepartment of Animal Sciences, The State University of New Jersey, 84 Lipman Dr., New Brunswick, New Jersey bDepartment of Ecology, Evolution, and Natural Resources, Rutgers, The State University of New Jersey, 84 Lipman Dr., New Brunswick, New Jersey 08901-8525;

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