Response of Adult Channel Catfish to Waterborne Exposures of Channel Catfish Virus

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Abstract
The response of adult channel catfish (Ictalurus punctatus) to channel catfish virus (CCV) was examined following waterborne exposures to the virus in the laboratory. Adult channel catfish that were survivors of experimental infections as juveniles and reared in the laboratory continued to have anti-CCV neutralizing activity in their plasmas 2 years following the last known exposures to CCV. There was no apparent increase in this activity following a second exposure to CCV. In contrast, adult channel catfish raised from the same stock but never exposed to CCV as juveniles became infected following waterborne exposures to CCV and one individual died from the viral infection. The surviving fish in this group responded to CCV exposure by producing anti-CCV neutralizing activity in the plasma, which was detected 1 week after exposure to virus and persisted until the end of the experiment 9 weeks later. Anti-CCV neutralizing activity persisted in the sera of adult channel catfish for 6 months after th...