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Early in the development of respiratory syncytial virus (RSV) vaccines severe disease occurred in children after receipt of formalin-inactivated RSV vaccine. Continuing efforts to develop an appropriately attenuated and immunogenic live RSV vaccine have given opportunities to assure that live vaccines are safe through surveillance of children after vaccination. In the present study, the rate of RSV-associated...
Intranasal and intramuscular immunizations of mice with the highly attenuated MVA strain of vaccinia virus expressing the respiratory syncytial virus (RSV) F or G glycoprotein induced higher RSV antibody titers than those achieved by infection with RSV and greatly restricted the replication of RS challenge virus in both the upper and lower respiratory tracts. In addition, a recombinant MVA expressing...
The cold-adapted (ca), temperature-sensitive (ts) respiratory syncytial virus (RSV) subgroup B vaccine candidate, designated RSV 2B33F, was found previously to be restricted in replication, immunogenic, and protective against wild-type (wt) virus challenge in rodents and African green monkeys. We sought to investigate the level of attenuation, immunogenicity and genetic stability of this vaccine candidate...
A cold-passage (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°C) was found previously to be tenfold restricted in its replication in mice as compared to wild-type virus and stable genetically...
Ts-1, a temperature sensitive (ts) mutant of RSV, was previously derived from RSV A2 virus by mutagenesis with 5-fluorouracil (5-FU). Ts-1 was attenuated for adult volunteers and seropositive children but retained a low level of virulence in seronegative infant vaccinees as indicated by the occurrence of upper respiratory tract disease. Ts-1 NG-1, a more defective derivative of ts-1, was produced...
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