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Persistent measles virus infection was established in two cell lines: Vero and McCoy. Vero cells were infected with a virus that had been propagated five times from an undiluted inoculum. Measles virus infection of McCoy cells caused no cytopathic lesions but led to the establishment of persistent infection. Haemadsorption (HA) and immunofluorescence (IF) results indicated that the majority of Vero and McCoy cells carried measles virus antigen localized in the cell membranes. Both cell lines released infectious virus into the medium. In Vero cells, the virus yield diminished with the number of cell passages. Our results suggest that the presence of defective interfering particles in Vero cells and an antiviral factor in the supernatant of McCoy cells contributed to the maintenance of persistent infection.
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