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Truncated Particles Produced in Fish Surviving Infectious Hematopoietic Necrosis Virus Infection: Mediators of Persistence?†
, 1998
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Presence of low level infected iridovirus in sea perch Lateolabrax sp. imported to Korea
"... We have identified an iridovirus CH-1 from sea perch Lateolabrax sp. healthy externally and imported from China to Korea. In a comparison of the nucleotide sequences of the five different genomic regions, the CH-1 appears to be closely related to the ISKNV, IVS-1 and Ehime-1 strains detected in Chin ..."
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We have identified an iridovirus CH-1 from sea perch Lateolabrax sp. healthy externally and imported from China to Korea. In a comparison of the nucleotide sequences of the five different genomic regions, the CH-1 appears to be closely related to the ISKNV, IVS-1 and Ehime-1 strains detected in China, Korea and Japan respectively. In quantitative comparison of the viral DNA, level of CH-1 in tissue of imported fish was 10,000 times lower than that of IVS-1 strain presented in the infected rock bream Oplegnathus fascia-tus of moribund stage. It allowed us to speculate the possibility of the asymtomatic iridovirus infection in the culturing sea perch. Such possibility of asymptomatic infection was supported by result of no appear-ance of dead fish with typical symptoms of iridoviral disease in keeping experiment of the imported sea pearch in laboratory for more than three weeks. Such asymptomatic infections with iridovirus were also found in spleen of the culturing and externally healthy sea perch of Korea by the presence of the iridoviral DNA in nested PCR. Key words: Iridovirus, ISKNV, Lateolabrax sp., Asymptomatic infection, Nested PCR Since the discovery of the first fish iridovirus, lymphocystis disease virus (LCDV), in 1962 (Walker, 1962), many new iridovirus-like pathogens have been reported from over 140 differ-ent species of fish worldwide (Essbauer and Ahne, 2001). The Iridoviridae family is subdivided into
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, 2005
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Early Kinetics of Infectious Hematopoietic Necrosis Virus (IHNV) Infection in Rainbow Trout
"... Abstract.—A series of experiments was carried out with infectious hematopoietic necrosis virus (IHNV; 193-110 isolate) in rainbow trout Oncorhynchus mykiss (weight,;1.2 g) to determine the duration of the patent period and the timing of onset of the infectious periods. We first attempted to transmit ..."
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Abstract.—A series of experiments was carried out with infectious hematopoietic necrosis virus (IHNV; 193-110 isolate) in rainbow trout Oncorhynchus mykiss (weight,;1.2 g) to determine the duration of the patent period and the timing of onset of the infectious periods. We first attempted to transmit IHNV to recipient fish from infected rainbow trout 2–3 d after they had been exposed. No infection transfer occurred despite high titers (104.79 to 104.91 plaque-forming units 5–8 d postexposure (dpe). To determine the number of secondary cases produced by one infectious individual, we exposed approximately 50 rainbow trout (weight,;1.5 g) in each of seven replicate tanks to a donor fish that had been infected with virus by bath exposure 3 d earlier. The prevalence of infection in recipient fish rose from 0.84 % at 2 dpe to 7.9 % at 6 dpe. Maximum incidence (22 cases) occurred between 2 and 4 dpe. No disease-specific mortalities occurred in recipient fish during the experiment. The titer of virus in both recipient and donor fish increased from 2 to 4 dpe. There was a positive correlation between the level of infection among donors and prevalence values among recipient fish (r2 5 0.60). The level of challenge by one infectious fish under the conditions provided was enough for infection transfer from sick cohabitant to susceptible fish but was not enough for initiation of a full-scale epizootic among recipients. Infectious hematopoietic necrosis virus (IHNV), a rhabdovirus, causes a disease (IHN) character-ized by extensive necrosis of hematopoietic tissues in early life stages of economically important sal-monids. Enzootic in the Northwest Pacific of North
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, 2008
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