“…injection [289,328,329,331,332,349]. Injection has also been used for DNA vaccines [347,349] and subunit vaccines [335,336,338,[340][341][342] and oral immunization strategies have been used either for inactivated, subunit or DNA vaccines [225,[333][334][335]341,343,348,351,352]. The oral vaccine was given to the fish mixed with food [343] or by oral gavage [333,341] and encapsulated using either chemical compounds [225,348] or Artemia [353].…”