In the period between 1970 and 1985 it was shown that injection of killed or attenuated virus was effective in preventing spring viraemia of carp (SVC) provided that the fish were vaccinated at optimal temperatures (≥ 18°C). Unfortunately, this approach was difficult to apply in traditional pond farming, where stocking often takes place in spring and autumn at temperatures far below 18°C. In recent years new and promising DNA vaccines (containing a glycoprotein of the SVC virus) have been developed, including a formulation that can be injected or given by oral route (feeding). These developments open new possibilities for protection of young fish and/or vaccination at optimal temperatures giving durable protection in traditional pond farming of carp.
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