An analysis of daily water samples collected from an index site on Big Soos Creek, Washington indicated intra-annual differences in the concentrations of waterborne Nanophyetus salmincola. Waterborne concentrations, quantified as gene copies/L, peaked during the fall (October-November 2016), decreased to very low concentrations over the winter (January-March 2017), and then increased in the spring and throughout the summer. High waterborne concentrations of N. salmincola DNA (2 × 106 gene copies/L) corresponded with live N. salmincola cercariae (mean = 3 cercariae/L) that were detected in companion water samples. Spikes in waterborne N. salmincola concentrations in October and November typically coincided with increases in streamflow; this combination resulted in elevated infection pressures during high water events in the fall. The peak in waterborne N. salmincola concentrations corresponded with an accompanying peak in tissue parasite density (metacercariae/posterior kidney) in Coho Salmon Oncorhynchus kisutch that were reared in the untreated water.

中文翻译：

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水性纳米藻盐生藻的年内变化

对从华盛顿 Big Soos Creek 的一个索引站点收集的每日水样进行的分析表明，水生 Nanophyetus salmincola 的浓度在年内存在差异。水性浓度，量化为基因拷贝/升，在秋季（2016 年 10 月至 11 月）达到峰值，在冬季（2017 年 1 月至 3 月）降至非常低的浓度，然后在春季和整个夏季增加。高浓度的 N. salmincola DNA（2 × 106 基因拷贝/L）与在伴生水样中检测到的活的 N. salmincola 尾蚴（平均值 = 3 个尾蚴/L）相对应。10 月和 11 月水生 N. salmincola 浓度的峰值通常与流量增加同时发生；这种组合导致秋季高水事件期间感染压力升高。