Abstract
Both fixed and street rabies virus when cultivated in McCoy cells caused cytopathic changes 24 to 72 h after infection, depending on the multiplicity of infection. The cytopathic effect (CPE) was easily recognizable and resembles that induced by other members of the Rhabdovirus group, such as vesicular stomatitis virus, in several cell cultures. Higher titers of the Pasteur strain (PV) of fixed rabies virus were found in supernatants of McCoy cells when compared to those in VERO cells. The virus titer increased with the number of passages attaining a high titer after three passages. Rabies antigens were detected by direct immunofluorescence labeling in most McCoy cells of the infected culture, and specific antibodies neutralized the virus growth and CPE. There was also inhibition by treatment of the cells with human interferon (HuIFN) -α or -γ, but not by murine interferon (MuIFN) -α, -gB or -γ. Rabies-infected McCoy cell cultures may provide a useful assay system, based on the induction of CPE, the high virus production and the sensitivity to IFN.
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