Caractérisation pathologique chez des poulets du virus vélogénique de la maladie Newcastle isolé chez une pintade

Abstract

Une bande de 160 coquelets Harco âgés de six semaines ont été inoculés par voie intramusculaire avec un isolat nigérian local de virus vélogénique de la maladie de Newcastle (VMN) obtenu à partir d'une pintade morte. Des signes cliniques de la maladie, principalement la dépression, des diarrhées verdâtres, la paralysie, l'opisthotonos et le torticolis, ont pu être observés sur les volailles trois jours après l'inoculation. Le taux de morbidité a été de 100 p. 100 alors que celui de mortalité a été de 92 p. 100. Au dix-huitième jour après l'inoculation, seul le torticolis a été encore présent chez certaines volailles. Les lésions macroscopiques principales ont été les hémorragies dans les muqueuses proventriculaires, des ulcères hémorragiques des intestins et une atrophie transitoire des organes lymphoïdes. Des coupes d'organes ont révélé des nécroses et des déplétions lymphocytaires des organes lymphoïdes, une endothéliose, une gliose et des manchons périvasculaires du cerveau et du cervelet. Ces observations ont indiqué que l'isolat provenait d'une souche vélogénique viscérotropique. Les auteurs proposent de considérer les ulcères hémorragiques dans les intestins comme des éléments diagnostiques du VMN vélogénique viscérotropique en l'absence de preuve épizootiologique de virus grippal aviaire.

Effects of Moringa oleifera methanolic leaf extract on the morbidity and mortality of chickens experimentally infected with Newcastle disease virus (Kudu 113) strain

“…Following this was greenish diarrhea, which is an indication of gastrointestinal lesion. This is also in agreement with what has been described by Okoye et al (2000) and Hamid et al (1991). Severe nervous signs were observed prominent of which were ataxia, paralysis and torticollis.…”

“…In this study, the incubation period of experimental ND was three days, which is in agreement with the report of Okoye et al (2000). Hamid et al (1991) reported an incubation period of 2 to 16 days.…”

“…Hamid et al (1991) reported an incubation period of 2 to 16 days. The morbidity rates observed were higher among birds in the unvaccinated and treated groups I and unvaccinated and untreated IV and this agrees with the reports that the morbidity and mortality of VND outbreak could be up to 100% in nonimmunized birds (Okoye et al, 2000). While the mortality in this study was 100% in group IV, it was 68% in group I, and also, 12 and 0% in the vaccinated and treated group II, and vaccinated and untreated group III, respectively.…”

“…Severe nervous signs were observed prominent of which were ataxia, paralysis and torticollis. The nervous involvement according to Okoye et al (2000) was due to the intramuscular route of inoculation of the virus. The post mortem lesion seen in the challenged birds were those of the VVND, but were more severe in group I, followed by those of the group IV as reported by Okoye et al (2000).…”

“…The nervous involvement according to Okoye et al (2000) was due to the intramuscular route of inoculation of the virus. The post mortem lesion seen in the challenged birds were those of the VVND, but were more severe in group I, followed by those of the group IV as reported by Okoye et al (2000). The post mortem lesion seen in the challenged birds were similar to those reported for VVND by Okoye et al (2000).…”