Cold-passaged, temperature-sensitive mutants of human respiratory syncytial virus (RSV) are highly attenuated, immunogenic, and protective in seronegative chimpanzees, even when RSV antibodies are infused shortly before immunization.

Abstract excerpt

A cold-passaged (cp) temperature-sensitive (ts) RSV mutant, designated RSV cpts-530, which possesses host-range mutations acquired during 52 passages at low temperature in bovine tissue culture and one or more ts mutations induced by chemical mutagenesis (shut-off temperature 39 degrees C) was found previously to be tenfold restricted in its replication in mice as compared to wild-type virus and stable...

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