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Summary A previously unknown virus was isolated from juvenile Atlantic salmon (Salmo salar) reared in fresh water. The virus induced syncytia in CHSE‐214 cells at 10–20°C. Optimum replication occurred at 15°C. Virions, purified from infected CHSE‐214 cells, were hexagonal to round with a mean diameter of 39.5 run (n = 20 SD = 0.32 nm). Virions did not possess an envelope as shown by resistance to chloroform treatments. Replication was not appreciaby inhibited by 50 pg/d 5‐bromo‐2'‐deoxyuridine indicating that the virus has a RNA genome. Waterborne exposures and intraperitoneal injections of the virus into juvenile Atlantic salmon did not cause mortality nor was virus detectable at 33 and 76 d post‐exposure. Similar results were obtained when rainbow trout (Oncorhyncbhus mykiss) were exposed to waterborne virus. Zusamrnenfassung Ein kleiner RNA‐Virus, vom Atlantischen Lachs (Salmo salar) isoliert Ein bisher unbekannter Virus wurde von Jungtieren des Atlantischen Lachses (Salmo salar) isoliert, die im Süßwasser aufgezogen wurden. Der Virus induzierte Synzytem in den CHSE‐214‐Zellen bei 10–20°C. Oprimale Vermehrung trat bei 15°C auf. Virionen, die gereinigt aus infizienen CHSE‐214‐Zellen isoliert wurden, waren hexagonal bis rund, mit einem Durchmesser von 39,5 nm (n=20; SD=0,32 μm). Die Virionen besaßen keine Hülle, wie durch die Resistenz gegenüber Chloroform nachgewiesen wurde. Die Vermehrung wurde durch 50 μg/ml 5‐bromo‐2'‐deoxyuridine nicht nennenswert beeinträchtigt, was darauf schließen läßt, daß der Virus ein RNA‐Genom besitzt. Exposition von Junglachsen gegenüber virushaltigem Wasser und intra‐peritonale Injektion des Virus hat keinerlei Sterblichkeit verursacht. Auch konnte der Virus in den Fischen 33 und 76 Tage nach der Behandlung nicht nachgewiesen werden. ähnliche Ergebnisse wurden mit Regenbogenforellen (Oncorhynchus mykiss erzielt, die virushdtigem Wasser ausgeserzt waren. Résumé Un petit virus RNA isolé sur le saumon atlantique (Salmo salar) Un virus auparavant inconnu a été isolé sur le saumon juvénile (Salmo salar) élevé en eau douce. Le virus provoquait des syncytíums dans les cellules CHSE‐214 sà 10–20°C. Une réplication optimum avait lieu sà 15°C. Les virions, purifiés des cellules CHSE‐214 infectées, étaient de forme hexaonale sà ronde avec un diamètre moyen de 39,5 nm (n=20 SD4,32 nm). Les virions ne possédaient pas d' enveloppe comme la résistance aux traitemenu chloroformes l' a montré. La réplication n' a pas été inhibée de faqçon appréciable avec 50 μg/ml 5‐bromo‐2'‐déoxyuridine, ce qui montre que le virus a un génome RNA. Des expositions sà l' eau infectée et des injections intrapéritonéales du virus chez le saumon atlantique juvénile ne causaient pas de mortaité et le virus n' était pas détectable aprés un délai de 33 et 76 jours apés l'exposition. Des résultats semblables ont été obtenus lorsque la truite (Oncorhynchus mykiss) a été exposée sà un virus transporté par l' eau.
Journal of Applied Ichthyology – Wiley
Published: Sep 1, 1990
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