RT Journal Article SR Electronic(1) A1 Macdonald, R. D.YR 1978 T1 Ringed Plaque Formation in Infectious Pancreatic Necrosis Virus Correlates with Defective Interfering Particle Production JF Journal of General Virology, VO 41 IS 3 SP 623 OP 628 DO https://doi.org/10.1099/0022-1317-41-3-623 PB Microbiology Society, SN 1465-2099, AB SUMMARY Four isolates of infectious pancreatic necrosis virus showed ringed plaque morphology on chinook salmon embryo cells, while six other isolates showed clear plaque morphology. One isolate chosen from the ringed-plaque class yielded defective interfering (DI) particles after as few as two virus passages starting with plaque-purified material; another isolate from the clear-plaque class failed to yield detectable numbers of DI particles., UL https://www.microbiologyresearch.org/content/journal/jgv/10.1099/0022-1317-41-3-623