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Rates of attack by culture-confirmed wild-type influenza virus A/H3N2, antigenically similar to the vaccine virus, for young children by treatment group. n, total number of evaluable children in each study group. CAIV-T 10^7, 107.0 ± 0.5 FFU per dose; CAIV-T 10^6, 106.0 ± 0.5 FFU per dose; CAIV-T 10^5, 105.0 ± 0.5 FFU per dose. One fluorescent focus unit is approximately equal to 1 50% tissue culture infective dose. Saline was used as the placebo.
