Optimal conditions for the isolation and growth of virulent canine distemper virus (CDV) in canine thymic and peripheral blood lymphocyte cultures were determined. Peak virus titers were seen from 3 to 6 days postinoculation of lymphocytes and depended on the multiplicity of infection. Dog lymphocytes were at least as susceptible as canine macrophages to infection with virulent CDV. Virus replication in lymphocytes resulted in higher virus titers than in dog lung macrophages. Peripheral blood lymphocytes (PBL) from CDV-immune dogs were as susceptible to CDV as were PBL from susceptible dogs.
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