Antibody Response and Protective Immunity of Chickens Vaccinated with Booster Dose of Recombinant Oil-AdjuvantedLeucocytozoon caulleryiSubunit Vaccine
Authors:
- Dennis V. UmaliDUDennis V. Umali
- Akira ItoAIAkira Ito
- Fletcher P del ValleFVFletcher P del Valle
- Kazutoshi ShirotaKSKazutoshi Shirota
- Hiromitsu KatohHKHiromitsu Katoh
- 1 December 2014
- journal article
- research article
- Published by American Association of Avian Pathologists (AAAP) in Avian Diseases
- Vol. 58 (4) , 609-615
Abstract
SUMMARY Leucocytozoon caulleryi is an economically important poultry pathogen that causes subclinical to fatal disease in chickens. Because of limited preventive and treatment options against this disease, an oil-adjuvanted recombinant vaccine (O-rR7) targeting the R7 protein of L. caulleryi second-generation schizonts was developed. Different vaccination programs, namely, single vaccination at 45 days (0.1-ml dose), single vaccination at 130 days (0.25 ml), and initial vaccination at 45 days (0.1 ml) followed by a booster dose at 130 days (0.25 ml) were explored to compare the effects of single and booster vaccination on antibody response, duration of protective immunity, and degree of clinical signs after experimental L. caulleryi infection. Of the three treatments groups, initial vaccination at 45 days followed by a booster vaccination at 130 days of age resulted to rapid increase in antibody titers, which persisted for up to 182 days. Antibody titers reached peak values 35 days and 14 days after initi... RESUMEN Respuesta de anticuerpos e inmunidad protectora en pollos vacunados con una dosis de refuerzo de una vacuna recombinante de Leucocytozoon caulleryi con adyuvante oleoso. Leucocytozoon caulleryi es un patógeno económicamente importante en la avicultura que causa una enfermedad que va de una presentación subclínica hasta una forma fatal en pollos. Debido a las opciones limitadas de prevención y tratamiento contra esta enfermedad, se desarrolló una vacuna recombinante con adyuvante oleoso (O-rR7) dirigidas a la proteína R7 de esquizontes de segunda generación de L. caulleryi. Se exploraron diferentes programas de vacunación, vacunación única a los 45 días (dosis de 0.1 ml), vacunación única a los 130 días (0.25 ml), y una vacunación inicial a los 45 días (0.1 ml), seguido de una dosis de refuerzo a los 130 días (0.25 ml), para comparar los efectos de la vacunación única y de refuerzo en la respuesta de anticuerpos, la duración de la inmunidad protectora y el grado de signos clínicos después de la inf...Keywords
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