This study aimed to investigate the prevalence of foodborne viruses in reservoirs (an important resource of irrigation water) and its correlation with environmental and weather factors. From May 2017 to November 2018, we visited ten reservoirs and a river in the Anseong region of South Korea and collected a total of 192 samples in accordance with the environment protection agency guidelines. We recorded the weather factors (temperature, humidity, and accumulated precipitation) and investigated the surrounding environment factors (livestock, fishing site, the catchment area of reservoirs, etc.). Our research results show that from the river and reservoirs, the detection rates of human norovirus GII, adenovirus, rotavirus, human norovirus GI, and astrovirus were 27.1, 10.4, 10.4, 4.16, and 3.1%, respectively. Their viral load ranged from −1.48 to 1.55 log₁₀ genome copies/l. However, hepatitis A virus was not detected in any irrigation water sample. Although no sampling was performed in winter, foodborne viruses and male-specific coliphages were frequently found during spring (40.78%) and autumn (39.47%). Interestingly, the significant correlation between the accumulative precipitation and the number of detected norovirus and adenovirus was confirmed by linear regression analysis. Furthermore, when the accumulative precipitation ranged from 20 to 60 mm, it significantly affected the viral load and prevalence. Among the environmental factors, recreational facilities such as fishing sites and bungalow fishing spots were identified as contamination sources by correlation analysis. Our research results confirmed the correlations between environmental contamination factors in the reservoir and weather factors with the prevalence of foodborne viruses in the reservoir. These facilitates the assessment of potential foodborne virus contamination during crop irrigation. In addition, predictive models including environmental and weather factors should be developed for monitoring and controlling the safety of irrigation waters in reservoirs.

中文翻译：

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天气和环境因素对韩国京畿道灌溉水中食源性病毒季节性流行的影响。

这项研究旨在调查食源性病毒在水库（一种重要的灌溉水资源）中的流行及其与环境和天气因素的关系。从2017年5月到2018年11月，我们按照环境保护机构的指导方针参观了韩国安城地区的10个水库和一条河流，共收集了192个样本。我们记录了天气因素（温度，湿度和累积降水量），并调查了周围的环境因素（牲畜，捕鱼地点，水库集水区等）。我们的研究结果表明，从河流和水库中，人类诺如病毒GII，腺病毒，轮状病毒，人类诺如病毒GI和星状病毒的检出率分别为27.1％，10.4、10.4、4.16和3.1％。他们的病毒载量范围从-1.48到1。₁₀基因组拷贝数/ l。但是，在任何灌溉水中都未检测到甲型肝炎病毒。尽管冬季没有进行采样，但在春季（40.78％）和秋季（39.47％）期间经常发现食源性病毒和男性特异性噬菌体。有趣的是，线性回归分析证实了累积降水量与检测到的诺如病毒和腺病毒数量之间的显着相关性。此外，当累积降水量在20至60 mm范围内时，会显着影响病毒载量和流行率。在环境因素中，通过相关分析将钓鱼场所和平房钓鱼点等娱乐设施确定为污染源。我们的研究结果证实了水库中环境污染因素和天气因素与水源中食源性病毒流行之间的相关性。这些有助于评估作物灌溉期间潜在的食源性病毒污染。此外，应建立包括环境和天气因素在内的预测模型，以监测和控制水库中灌溉水的安全性。