The present study evaluated the efficacy of a vectorized vaccine against Newcastle disease virus (vENC) applied in the hatchery. Two hundred one-day-old chicks were distributed in four experimental vaccination groups against vENC: T1: Live attenuated vaccine + inactivated vaccine, T2: Live attenuated vaccine, T3: Live attenuated vaccine + vectorized vaccine, T4: Unvaccinated control group. All chicks were also vaccinated against infectious bronchitis, Marek and Gumboro viruses at day 1. The birds were challenged on the day 26 with a highly pathogenic field pathogenic strain. Mortality, post-challenge clinical signs, necropsy lesions and antibody response against vENC were evaluated. Chicks vaccinated with the vENC vectorized vaccine had a lower mortality (2%) compared to birds vaccinated with live attenuated strains (12.5% ​​for T1 and 18.4% for T2 respectively; p<0.05). Likewise,...

The present study evaluated the efficacy of a vectorized vaccine against Newcastle disease virus (vENC) applied in the hatchery. Two hundred one-day-old chicks were distributed in four experimental vaccination groups against vENC: T1: Live attenuated vaccine + inactivated vaccine, T2: Live attenuated vaccine, T3: Live attenuated vaccine + vectorized vaccine, T4: Unvaccinated control group. All chicks were also vaccinated against infectious bronchitis, Marek and Gumboro viruses at day 1. The birds were challenged on the day 26 with a highly pathogenic field pathogenic strain. Mortality, post-challenge clinical signs, necropsy lesions and antibody response against vENC were evaluated. Chicks vaccinated with the vENC vectorized vaccine had a lower mortality (2%) compared to birds vaccinated with live attenuated strains (12.5% ​​for T1 and 18.4% for T2 respectively; p<0.05). Likewise,...

A vaccination programme against Avian metapneumovirus (aMPV) in broilers was evaluated using a live virus vaccine against aMPV with the strain chicken 1062, title of 102.4 DICT50 sprayed at first day of age. The study conducted in two commercial farms of poultry growers, located in a region where the Swollen Head Syndrome (SHS) is prevalent. A flock of 185 593 1-day old broilers of both sexes, Cobb Vantress 500 line, were distributed in a vaccinated group against aMPV and a control group not vaccinated against aMPV. It was evaluated the presentation of SHS, intensity of respiratory signs, post mortem lesions, productive parameters, mortality, and serological response by indirect ELISA test. Only the vaccinated group had birds with SHS during the 3rd and 4th week of age, showing intense respiratory signs and severe post mortem lesions at respiratory tract level. The control group showed b...

Se evaluó la efectividad de un programa de vacunación contra Metapneumovirus aviar (aMPV) en pollos de carne, empleando una vacuna a virus vivo contra el aMPV conteniendo la cepa pollo 1062 subtipo B, con un título de 102.4 DICT50. La vacuna se administró al 1er día de edad por aspersión. El estudio se realizó en dos granjas comerciales de una integración avícola ubicada en una zona donde el Síndrome de Cabeza Hinchada (SCH) es un problema frecuente. Se utilizó un total de 185 593 pollos de 1 día de edad, de ambos sexos, de la línea Cobb Vantress, distribuidos en un grupo experimental vacunado contra el aMPV y un grupo control no vacunado contra aMPV. Se evaluó la presentación de SCH, intensidad de signos clínicos respiratorios, lesiones post mortem, parámetros productivos, mortalidad y respuesta serológica mediante la prueba de ELISA indirecta. Sólo el grupo experimen...