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首页> 外文期刊>Bulletin of the European Association of Fish Pathologists >Virulence of Chilean field isolates of Flavobacterium psychrophilum in Atlantic salmon (Salmo salar L.) parr
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Virulence of Chilean field isolates of Flavobacterium psychrophilum in Atlantic salmon (Salmo salar L.) parr

机译：智利野黄杆菌在大西洋鲑（Salmo salar L.）parr中的毒力

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摘要

In the current study, Atlantic salmon (Salmo solar L.) were challenged with five different Chilean field isolates of F. psychrophilum to evaluate their virulence and their ability to induce mortality via the intramuscular route. Virulence of the field isolates varied from avirulent to highly virulent, while mortality progression and ulcer development depended on the challenge isolate and dose used. Although high mortality was reproducibly induced during the experimental infections, our results suggest that Atlantic salmon are less susceptible to experimental challenge with F. psychrophilum, compared to what has previously been reported in challenge studies on rainbow trout (Oncorhynchus mykiss L.) using similar challenge doses. Interestingly, challenge of Atlantic salmon with a highly virulent strain of F. psychrophilum, isolated from rainbow trout, did not induce any mortality. Overall, our results add weight to the suggestions that intramuscular injection is presently the only feasible challenge route for inducing high levels of mortality in larger salmonids and that optimization of the infectious load for experimental studies may be facilitated by careful selection of challenge strain.
机译：在当前的研究中，大西洋鲑（Salmo solar L.）受到了五个不同的智利嗜热镰刀菌分离株的攻击，以评估它们的毒性和通过肌肉内途径诱发死亡的能力。野外分离株的毒力从无毒力到高毒力不等，而死亡率的进展和溃疡的形成则取决于挑战性分离物和使用的剂量。尽管在实验性感染过程中可再现地诱导了高死亡率，但我们的结果表明，与之前在虹鳟鱼（Oncorhynchus mykiss L.）中使用类似挑战的挑战研究中报道的结果相比，大西洋鲑对拟南芥更不易受到挑战。剂量。有趣的是，用从虹鳟鱼中分离出的高毒力的嗜热镰刀菌对大西洋鲑鱼的攻击没有引起任何死亡。总的来说，我们的结果增加了以下建议的重要性：肌肉注射目前是诱导较大鲑鱼高死亡率的唯一可行挑战途径，通过精心选择挑战菌株可以促进针对实验研究的感染负荷的优化。

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