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Seven complementation groups of respiratory syncytial virus temperature-sensitive mutants.

ABSTRACT

Fifteen temperature-sensitive mutants of the RSN-2 strain of respiratory syncytial virus have been classified into six complementation groups, two of which appeared to be homologous with two of the three complementation groups of the A2 strain described by Wright et al. (P. F. Wright, M. A. Gharpure, D. S. Hodes, and R. M. Chanock, Arch. Gesamte Virusforsch, 41:238--247). Thus seven complementation groups of respiratory syncytial virus, designated A, B, C, D, E, F, and G, have been defined. The frequency and type of mutant isolated varied according to strain; group C was unique to the A2 strain, and groups D, E, F, and G were unique to the RSN-2 strain. The highest complementation indexes were obtained by preincubation for 7 h at permissive temperature, followed by incubation at restrictive temperature for 40 to 50 h in the case of A2 strain mutants or 80 to 90 h for RSN-2 strain mutants. Genetic recombination was not detected.

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