[Plaque activity of vaccinal and epizootic Newcastle virus].
The plaque technique is applied to the type differentiation of the Newcastle disease viruses, 0.5 per cent agarose being used as a nutritive overlayer. The epizootic Newcastle disease strains are characterized by a heterogenic plaque population in which the large plaques are prevalent, averaging 3--4 mm, with an irregular round form, an unclearly delineated diffuse edge, and a red center. The vaccinal strains (B1 and K) yield a homogeneous small-plaque population, the plaques themselves being 1--2 mm large, with a regular round shape, a well delineated edge, and a bright center.
D000818:Animals; D003588:Cytopathogenic Effect, Viral; D004196:Disease Outbreaks / Q000662:veterinary; D009521:Newcastle Disease / Q000382:microbiology*; D009522:Newcastle disease virus / Q000472:pathogenicity; D013045:Species Specificity; D014765:Viral Vaccines; D014774:Virulence
D014765:Viral Vaccines
Plakova aktivnost na vaksinni i epizootichni niukiasulski virusi.