Yersinia ruckeri : a characterization of the carrier state in steelhead trout (Salmo gairdneri) Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/5999n710x

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  • Fish, asymptomatically infected with Enteric Redmouth Bacterium (ERMB), were tested for their ability to transmit bacteria to non-infected fish. Unstressed carrier fish were unable to transmit enough bacteria to cause epizootics or produce carrier fish. However, when the ERMB carriers were stressed with heat, sufficient bacteria were shed to infect recipient fish. Experimentally infected fish were also examined to determine the number of ERMB carriers among the survivors. There was an increase and decrease in the number of carriers that could be detected at different intervals of time. This increase and decrease of carriers was correlated with the cyclic shedding (reported theory proposed) by Busch and Lingg (1975) for this bacterium. Immunized fish were challenged with the ERMB in water. These fish became temporary carriers of the bacteria. However, unlike the typical carrier, these previously immunized fish carried detectable bacteria for a maximum of three days. After this period, no bacteria was detectable and at no time were these fish capable of infecting other healthy fish.
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