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首页> 美国卫生研究院文献>Frontiers in Physiology >Occurrence of OsHV-1 in Crassostrea gigas Cultured in Ireland during an Exceptionally Warm Summer. Selection of Less Susceptible Oysters
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Occurrence of OsHV-1 in Crassostrea gigas Cultured in Ireland during an Exceptionally Warm Summer. Selection of Less Susceptible Oysters

机译：异常温暖的夏天爱尔兰的Crassostrea gigas中出现OsHV-1。易感牡蛎的选择

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The occurrence of OsHV-1, a herpes virus causing mass mortality in the Pacific oyster Crassostrea gigas was investigated with the aim to select individuals with different susceptibility to the infection. Naïve spat transferred to infected areas and juveniles currently being grown at those sites were analyzed using molecular and histology approaches. The survey period distinguishes itself by very warm temperatures reaching up to 3.5°C above the average. The virus was not detected in the virus free area although a spread of the disease could be expected due to high temperatures. Overall mortality, prevalence of infection and viral load was higher in spat confirming the higher susceptibility in early life stages. OsHV-1 and oyster mortality were detected in naïve spat after 15 days of cohabitation with infected animals. Although, infection was associated with mortality in spat, the high seawater temperatures could also be the direct cause of mortality at the warmest site. One stock of juveniles suffered an event of abnormal mortality that was significantly associated with OsHV-1 infection. Those animals were infected with a previously undescribed microvariant whereas the other stocks were infected with OsHV-1 μVar. Cell lesions due to the infection were observed by histology and true infections were corroborated by in situ hybridization. Survivors from the natural outbreak were exposed to OsHV-1 μVar by intramuscular injection and were compared to naïve animals. The survival rate in previously exposed animals was significantly higher than in naïve oysters. Results derived from this study allowed the selection of animals that might possess interesting characteristics for future analysis on OsHV-1 resistance.
机译：为了选择在太平洋牡蛎Crassostrea gigas中引起大规模死亡的疱疹病毒OsHV-1的发生，旨在选择对感染有不同敏感性的个体。幼稚的鱼苗转移到受感染的地区，并使用分子和组织学方法分析了这些地区目前正在生长的幼鱼。调查期间的特征是非常温暖的温度，比平均温度高出3.5°C。尽管由于高温可能会导致疾病扩散，但在无病毒区域未检测到该病毒。吐口水的总死亡率，感染率和病毒载量较高，证实了生命早期阶段的易感性较高。与感染动物同居15天后，在幼稚的鱼苗中检测到OsHV-1和牡蛎死亡率。尽管感染与吐水的死亡率有关，但海水温度高也可能是最暖地点的死亡的直接原因。一只幼鱼遭受异常死亡的事件，这与OsHV-1感染显着相关。这些动物感染了先前未描述的微变种，而其他种群则感染了OsHV-1μVar。通过组织学观察到由感染引起的细胞损伤，并且通过原位杂交证实了真正的感染。自然爆发的幸存者通过肌肉注射暴露于OsHV-1μVar，并与幼稚动物进行了比较。以前接触过的动物的存活率显着高于幼稚的牡蛎。这项研究得出的结果允许选择可能具有有趣特征的动物，以便将来对OsHV-1抗性进行分析。

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