Abstract

Avian leukosis viruses of subgroups B, D, F, and one strain of reticuloendotheliosis virus (REV) are able to make plaques in several lines of chick embryo fibroblasts. Moreover, plaque formation with some strains of subgroup A is obtained only in chicken fibroblasts of C C phenotype. One exception is RAV-3 which produces plaque in line 6 ( C E ) only. Several important steps for the reproducibility of the assay are described. Of all the vital stains tested, only neutral red incorporated into the agar overlay is capable of inducing the formation of plaques. Several lysosome stabilizers and labilizers are examined and their role in the mechanism of plaque formation is discussed.

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