Persistentin vitro interaction of virulent and attenuated canine distemper virus with bovine cells

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Abstract
Bovine macrophage and non-macrophage cultures were infected with either virulent or attenuated canine distemper virus (CDV). Macrophages were resistant to virulent CDV; however, they supported growth of the attenuated virus. Nonmacrophage cultures supported growth of both virus variants in a persistent, non-lytic manner. Major differences between these two systems ofin vitro viral persistence were seen in the host cell spectrum of progeny virus and the outcome of cocultivation experiments with Vero cells. Results obtained indicate thatin vivo virulence of CDV is not linked to maturation in a macrophage, but rather, propagation in a given cell culture system results in selective growth of virulent or attenuated viral mutants. It is further concluded thatin vivo virulence andin vitro growth potential of CDV are disparate properties of the virion.