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Research Institute for Viral Preparations, Moscow 109088, U.S.S.R.
Two human cell cultures, HEp-2 and L-41, persistently infected with mumps virus, produced small amounts of slowly replicating small-plaque infectious virus and detectable amounts of defective interfering virus particles which were similar to standard mumps virus in polypeptide composition, contained subgenomic size RNAs and interfered with standard mumps virus replication in susceptible cells.
Keywords: mumps virus, persistence, defective virus particles
Received 25 March 1982;
accepted 8 July 1982.
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