A fish farmer whose production unit is situated in an area neighbouring on the infected area, can and should vaccinate against this disease even though his unit is in an area considered free of disease.
Zivkopis, kura teritorija robežojas ar slimības skarto teritoriju var un viņam vajadzētu vakcinēt pret šo slimību, lai arī viņa daļa atrodas teritorijā, kuru uzskata par brīvu no slimībām.