The poultry red mite, Dermanyssus gallinae, is a blood-feeding parasite of layer hens and a potential vector of several avian infectious agents. High infestation with D. gallinae in layer farm buildings could result in economic losses, and the mites may act as a reservoir of avian pathogens within farms. This study aimed to assess the prevalence of D. gallinae in layer farm buildings in Korea and to investigate avian pathogens in the collected mites. The mite samples were collected from 36 Korean layer farm buildings on 21 farms nationwide. Information obtained from each farm building included the flock size, flock age, methods for controlling D. gallinae, and cleaning status. Association between these variables and the population density of D. gallinae was analyzed. Additionally, the presence of 10 avian pathogens was assessed using DNA samples from mites collected in 16 farm buildings. The prevalence of D. gallinae was 75% at the farm building level (90.5% at the farm level). Repetitive cleaning procedures for each building were significantly related with the mite infestation level, and the most influential factor for determining the mite population in the layer farm buildings. In the 16 DNA samples, we detected avian pathogenic Escherichia coli (n = 6), wild-type fowlpox virus (n = 3), wild-type Marek’s disease virus (n = 2), chicken anemia virus (n = 1), and fowl adenovirus (n = 1). These findings suggest that repetitive cleaning procedures for the layer farm buildings could decrease the numbers of D. gallinae which may transmit avian pathogens within the farm.

中文翻译：

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韩国产蛋鸡家禽红螨（Dermanyssus gallinae）的流行和螨中存在禽病原体。

家禽红螨（Dermanyssus gallinae）是母鸡的食血寄生虫，也是几种禽类传染病的潜在媒介。在层状农舍中大量感染D. gallinae可能会导致经济损失，而螨虫可能会成为农场内禽病原体的储存库。这项研究旨在评估韩国鸡舍中D. gallinae的流行情况，并调查收集到的螨中的禽病原体。螨虫样本是从全国21个农场的36层韩式农场建筑中采集的。从每座农舍获得的信息包括鸡群的大小，鸡群的年龄，控制D. gallinae的方法以及清洁状态。分析了这些变量与鸡血石D种群密度之间的关联。此外，使用从16家农舍中收集的螨虫的DNA样品评估了10种禽病原体的存在。在农场建筑水平上，D。gallinae的患病率为75％（在农场水平上为90.5％）。每栋建筑物的重复清洁程序与螨虫侵袭程度显着相关，并且是决定分层农场建筑物中螨虫种群数量的最重要因素。在16个DNA样本中，我们检测到了禽致病性大肠杆菌（n  = 6），野生型禽痘病毒（n  = 3），野生型马立克氏病病毒（n = 2），鸡贫血病毒（n  = 1）和禽腺病毒（n  = 1）。这些发现表明，对农场的多层建筑进行重复清洁程序可以减少可能在农场内传播禽病原体的鸡毛线虫的数量。