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Four live influenza A/Victoria/75 (H3N2) recombinant virus vaccines were administered intranasally to a total of 50 volunteers who had little or no detectable serum neutralizing antibody. A recombinant with ts-1[E] having a 38 degrees C shut-off temperature caused febrile reactions or systemic reactions or both in 21% of the volunteers, but one with ts-1A2 having a 37 degrees C shut-off temperature caused no illness. Two recombinants prepared with cold-adapted A/Ann Arbor/6/60 caused 9% febrile reactions or systemic reactions or both. Virus shedding occurred in a minority of the 50 volunteers, but 90% developed a serum neutralizing antibody response. Wild-type A/Victoria/75 virus challenge of 34 of the vaccinated volunteers and 12 others who had had prior natural A/Victoria/75 virus infection revealed similar and significant protection when compared with the 96% infection and 68% febrile illness or systemic illness or both observed in 25 unvaccinated volunteers with little or no serum antibody. These results encourage continued efforts toward development of live influenza virus vaccines.

Live influenza A/Victoria/75 (H3N2) virus vaccines: reactogenicity, immunogenicity, and protection against wild-type virus challenge