نتایج جستجو برای: newcastle disease virus strain v4
تعداد نتایج: 1992021 فیلتر نتایج به سال:
A strain each of mumps and Newcastle disease virus and five strains of influenza virus were found to be capable of removing all the receptors for this group of viruses from fowl red cells. Five virus strains were tested for their capacity to inactivate the virus hemagglutinin of human plasma and of egg white. In the case of egg white all strains including mumps and Newcastle disease virus inact...
The establishment of a successful plaque method for counting infectious virus particles by Dulbecco (1952), with subsequent refinements by Dulbecco and Vogt (1953, 1954a), makes it possible to quantitatively assay animal viruses with a high degree of accuracy in a manner comparable to assays of bacterial viruses. Two methods of assay commonly used in characterizing any particular Newcastle dise...
despite routine vaccination programs against newcastle disease (nd), sporadic cases have occasionally occurred that remain a constant threat to commercial poultry. ten isolates of newcastle disease viruses (ndv) from infected broiler chicken cases were obtained from various locations in fars province during 2009-2011 and genetically analyzed using reverse transcription polymerase chain reaction...
Newcastle disease (ND) is one of the most serious illnesses of chickens. Live vaccines are widely used to prevent chicken from the disease all over the world. To access the effective and potentiate ND vaccine, a homogenous subpopulation from LaSota strain was selected following cultivation of the virus on primary chicken embryofibroblast (CEF) cells. Pathogenicity indices and molecular characte...
Our study demonstrates the repeated isolation of vaccine-derived Newcastle disease viruses from different species of wild birds across four continents from 1997 through 2014. The data indicate that at least 17 species from ten avian orders occupying different habitats excrete vaccine-derived Newcastle disease viruses. The most frequently reported isolates were detected among individuals in the ...
background & aim: the recent study was conducted to investigate the effects of thyme extract in drinking water on immune response of broiler chickens. experimental: a total of 245 day-old broiler chicks were purchased and 20 chicks were bled for determination maternal antibody and remaining chicks divided into 5 equal groups. chickens of group a, b and c received 0.1%, 0.15% and 0.2% ofthy...
multiple technological levels the necessity of developing vaccine quality control systems is one of the requirements of our country Coordinated tests of the absence of externous agents in biological substances are considered as a major international concern for veterinary vaccines. Exogenous agents such as Newcastle disease virus, avian leukosis virus, infectious laryngotracheitis virus (ILTV)...
BACKGROUND: Newcastle disease virus (NDV) is the causativeagent of the Newcastle disease (ND), a highly contagiousdisease in birds that causes significant economic losses to thepoultry industry worldwide. ND is endemic in Iran and outbreaksare reported regularly in commercial poultry flocks and differentspecies of birds. OBJECTIVES:The current study was carried outto characterize NDV based on p...
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