Patent
A novel Edwardsiella ictaluri E-ict-VL33 strain, a vaccine derived from the novel Edwardsiella ictaluri E-ict-VL33 strain, especially in immersion form and oral form, and a method for protecting fishes from the infection of Edwardsiella ictaluri , especially catfish, the method including a primary immersion immunization using immersion vaccine, and after an appropriate period, boosting by oral vaccination, resulting in a strong and long-lasting immunity for fishes.
1. A method for improving fish immunity against Edwardsiella ictaluri comprising: administering an Edwardsiella ictaluri vaccine composition that comprises an Edwardsiella ictaluri E-ict-VL33 strain which is ATCC deposit number PTA-10711, and wherein the Edwardsiella ictaluri vaccine composition is prepared from the inactivation of the Edwardsiella ictaluri E-ict-VL33 strain by an inactivation agent to fish by immersion for primary immunization; and then administering the vaccine composition to fish by oral delivery for boost immunization.
2. The method as recited in claim 1 , wherein before the Edwardsiella ictaluri vaccine composition is administered to fish by oral delivery, the vaccine composition is spray-coated on the outside of a feed, and then the coated feed is further be sprayed with a oleaginous substance to obtain a feed coated by the vaccine composition.
3. The method as recited in claim 2 , wherein the oleaginous substance is at least one selected from the group consisting of: mineral oil, plant oil and animal oil.