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Development of a multiplex RT-PCR assay for simultaneous detection of the major viruses that affect rainbow trout (Oncorhynchus mykiss)

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Abstract

The major viral diseases that affect rainbow trout (Oncorhynchus mykiss) are viral haemorrhagic septicaemia, infectious haematopoietic necrosis, infectious pancreatic necrosis and sleeping disease. In the presented study, we developed a multiplex RT-PCR (mRT-PCR) assay for the simultaneous detection of these four rainbow trout viruses in a single assay. The choice of primers was carried out based on the expected size of the fragments, the temperature and time required for the amplification, and the specificity for the target sequence. Firstly, the method was optimised using reference strains of viral haemorrhagic septicaemia virus (VHSV), infectious haematopoietic necrosis virus (IHNV), infectious pancreatic necrosis virus (IPNV) and sleeping disease virus (SDV) cultivated with permissive cell culture lines; subsequently, the method was used for the identification of these viral infections in rainbow trout samples. Twenty-two samples of rainbow trout, clinically suspected of having viruses, were analysed by the developed method to detect the presence of the four viruses, by directly analysing the animal tissues. The mRT-PCR method was able to efficiently detect the viral RNA in infected cell culture supernatants and in tissue samples, highlighting the presence of single infections as well as co-infections in rainbow trout samples. VHSV/SDV and IHNV/SDV co-infections were demonstrated for the first time in rainbow trout. The mRT-PCR method was revealed to be an accurate and fast method to support traditional diagnostic techniques in the diagnosis of major viral diseases of rainbow trout.

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Acknowledgments

The cell lines and the viral strains used in the study were kindly supplied by Dr. A. Toffan (IZSVe, Italy) and by Dr. M. Prearo (IZSTo, Italy).

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Authors and Affiliations

  1. Department of Veterinary Medical Sciences, University of Bologna, Cesena Campus Viale Vespucci, 2, 47042, Cesenatico, FC, Italy

    Ana C. A. S. Pinheiro, Enrico Volpe, Donatella Principi, Santino Prosperi & Sara Ciulli

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  1. Ana C. A. S. Pinheiro
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  2. Enrico Volpe
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  3. Donatella Principi
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  4. Santino Prosperi
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  5. Sara Ciulli
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Correspondence to Sara Ciulli.

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Pinheiro, A.C.A.S., Volpe, E., Principi, D. et al. Development of a multiplex RT-PCR assay for simultaneous detection of the major viruses that affect rainbow trout (Oncorhynchus mykiss). Aquacult Int 24, 115–125 (2016). https://doi.org/10.1007/s10499-015-9912-9

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