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The relationship of two early events in the establishment of infection by avian retroviruses, the inhibition of viral DNA synthesis in stationary avian cells and the secondary infection which occurs after infection of replicating cells, was investigated. When neutralizing antibody to spleen necrosis virus was used to prevent secondary infection, the amount of unintegrated linear spleen necrosis virus DNA detected was much lower in infected stationary cells than in infected replicating cells. The amount of unintegrated linear spleen necrosis virus DNA in stationary cells was less than one copy per cell even at high multiplicities of infection. Viral DNA synthesis resumed after stimulation of the cells to replicate. The time of this viral DNA synthesis was closely correlated with renewed cellular DNA synthesis. In addition, blocking secondary infection of replicating cells prevented the rate of virus production from reaching the high levels usually associated with a normal productive infection by SNV. Virus production increased if secondary infection was allowed. However, this rise in virus production was not proportional to the amounts of viral DNA integrated after secondary infection.

Establishment of infection by spleen necrosis virus: inhibition in stationary cells and the role of secondary infection