Abstract
Neurovirulent TYCSA strain and attenuated Schwarz strain of measles virus and Halle strain of subacute sclerosing panencephalitis (SSPE) virus replicated in cultures of human lymphoid cell lines of the T-cell type, MOLT-3, MOLT-4 and CCRF-CEM. TYCSA and Halle strains grew rapidly, but Schwarz strain grew slowly in these cell lines. Furthermore, these three strains established persistent infection in CCRF-CEM cells but not in the other cell lines. In these persistently infected cultures an almost entire population of cells were shown to be infected and infectious virus was produced constantly for over 100 days. Cells persistently infected with Schwarz strain contained nucleocapsid structures in both the nucleus and cytoplasm and produced low titered infectious virus, whereas nucleocapsid structures were observed only in the cytoplasm of cells persistently infected with either TYCSA or Halle strain and the titers of infectious virus produced from these cells were high.
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