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Department of Chemistry, Biology and Microbiology Limburgs Universitair Centrum, B-3610 Diepenbeek, Belgium
Department of Human Biology Rega Institute University of Leuven, B-3000 Leuven, Belgium
Sendai and measles viruses were tested for their interferon-inducing capacity in human lymphoblast cells. Sendai virus reproducibly induced considerable amounts of interferon (1 research reference interferon unit/103 cells), but no increase in infectious virus titre was observed. Two EdmonstonEnders strains of measles virus grew very well. The attenuated (A) strain was a good interferon inducer (4 units/103 cells), while the virulent (V) strain induced only minimal amounts at a high multiplicity of infection. Pre-treatment of the cells with 5-iododeoxyuridine (IdUrd) had no effect on the growth of Sendai or EE measles virus and on interferon yields induced by Sendai virus. It slightly potentiated interferon induction by EE measles virus. Partial u.v.-light-inactivation of Sendai virus infectivity resulted in a parallel loss in interferon-inducing capacity.
Received 29 December 1976;
accepted 27 May 1977.
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