RESUMEN
Peste des petits ruminants (PPR) is a highly contagious, economically important viral disease of sheep and goats with high morbidity and mortality rates. In order to control the disease effectively, highly sensitive diagnostic tests coupled with potent vaccines are important pre-requisites. At present, there are three live attenuated PPR vaccines available in India including Sungri 96, Arasur 87 and Coimbatore 97. Indian Veterinary Research Institute (IVRI) Mukteswar developed the PPR Sungri 96 (isolate of goat origin) vaccine; while Tamil Nadu Veterinary and Animal Sciences University (TANUVAS) developed the Arasur 87 (isolate of sheep origin) and Coimbatore 97 (isolate of goat origin). In this study, the potency of these vaccines including a fourth vaccine from Institute of Animal Health and Veterinary Biologicals, Bangalore (IAH&VB) were tested as per the office International des Epizooties (OIE) guidelines by challenge studies in sheep and goats and their efficacies were evaluated using PPR C-ELISA. Potency tests of these vaccines in sheep and goats revealed that three of the vaccines were potent; however, the IAH &VB vaccine was comparatively less potent. The three vaccines could presumably be used for mass vaccination of both sheep and goats while contemplating PPR control program.
Asunto(s)
Enfermedades de las Cabras/inmunología , Peste de los Pequeños Rumiantes/veterinaria , Virus de la Peste de los Pequeños Rumiantes/inmunología , Enfermedades de las Ovejas/inmunología , Vacunas Virales/inmunología , Animales , Enfermedades de las Cabras/prevención & control , Enfermedades de las Cabras/virología , Cabras , Peste de los Pequeños Rumiantes/inmunología , Peste de los Pequeños Rumiantes/prevención & control , Ovinos , Enfermedades de las Ovejas/prevención & control , Enfermedades de las Ovejas/virología , Resultado del Tratamiento , Vacunación/métodos , Vacunación/normas , Vacunas Virales/administración & dosificación , Vacunas Virales/normasRESUMEN
Four serotype 1 field strains of infectious bursal disease virus (IBDV) and one reference standard serotype 1 strain were tested for their ability to agglutinate peripheral blood lymphocytes of chickens. All the five strains agglutinated chicken lymphocytes. The agglutination was not inhibited by serotype 1 reference anti-IBDV serum. These results suggest the need for detailed analysis of IBDV ligand(s) and cell surface receptor(s) relationships.
Asunto(s)
Infecciones por Birnaviridae/veterinaria , Virus de la Enfermedad Infecciosa de la Bolsa/fisiología , Linfocitos/virología , Enfermedades de las Aves de Corral , Aglutinación , Animales , Antígenos Virales/análisis , Infecciones por Birnaviridae/diagnóstico , Embrión de Pollo , Pollos , Virus de la Enfermedad Infecciosa de la Bolsa/clasificación , Virus de la Enfermedad Infecciosa de la Bolsa/aislamiento & purificación , Linfocitos/fisiología , Pruebas de Neutralización/veterinaria , SerotipificaciónRESUMEN
Eleven Newcastle disease virus (NDV) isolates obtained from outbreaks of disease in chickens (9) and Japanese quail (2) in Tamil Nadu, India were characterised in pathogenicity tests, antigenically, using mouse monoclonal antibodies (MAbs), and other established tests devised to distinguish between different strains. All 11 isolates were shown to be highly virulent for chickens. In indirect immunoperoxidase tests used to assess the ability of a panel of 28 MAbs to bind to infected cell cultures, 10 of the isolates showed an identical reaction pattern, the other isolate (No. 4) failed to react with one MAb which bound to cells infected with the other isolates. Isolates 9 was unstable at pH 3 while the other 10 were stable. All other properties were shared by the 11 isolates.