Isolation and analysis of the vaccine potential of an attenuated Edwardsiella tarda strain

文献类型： 外文期刊

第一作者： Sun, Yun

作者： Sun, Yun;Liu, Chun-sheng;Sun, Li;Sun, Yun;Liu, Chun-sheng

作者机构：

关键词： Edwardsiella tarda;Live attenuated vaccine;Rifampicin resistance;Immersion;Oral vaccine

期刊名称：VACCINE （ 影响因子：3.641； 五年影响因子：3.816 ）

ISSN： 0264-410X

年卷期： 2010 年 28 卷 38 期

页码：

收录情况： SCI

摘要： Edwardsiella tarda is an important aquaculture pathogen that can infect a wide range of marine and freshwater fish worldwide. In this study, a modified E. tarda strain, TX5RM, was selected by multiple passages of the pathogenic E. tarda strain TX5 on growth medium containing the antibiotic rifampicin. Compared to the wild type strain, the rifampicin-resistant mutant TX5RM (i) shows drastically increased median lethal dose and reduced capacity to disseminate in and colonize fish tissues and blood; (ii) exhibits slower growth rates when cultured in rich medium or under conditions of iron depletion; and (iii) differs in the production profile of whole-cell proteins. The immunoprotective potential of TX5RM was examined in a Japanese flounder (Paralichthys olivaceus) model as a vaccine delivered via intraperitoneal injection, oral feeding, bath immersion, and oral feeding plus immersion. All the vaccination trials, except those of injection, were performed with a booster at 3-week after the first vaccination. The results showed that TX5RM administered via all four approaches produced significant protection, with the highest protection levels observed with TX5RM administered via oral feeding plus immersion, which were, in terms of relative percent of survival (RPS), 80.6% and 69.4% at 5- and 8-week post-vaccination, respectively. Comparable levels of specific serum antibody production were induced by TX5RM-vaccinated via different routes. Microbiological analyses showed that TX5RM was recovered from the gut, liver, and spleen of the fish at 1-10 days post-oral vaccination and from the spleen, liver, kidney, and blood of the fish at 1-14 days post-immersion vaccination. Taken together, these results indicate that TX5RM is an attenuated E. tarda strain with good vaccine potential and that a combination of oral and immersion vaccinations may be a good choice for the administration of live attenuated vaccines. (C) 2010 Elsevier Ltd. All rights reserved.

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