TABLE 4.

Predicted vaccine efficacy and 95% CIs estimated for unvaccinated and vaccinated infants and toddlers with titers below the different SBA cutoffs 7 to 9 months after vaccination with the MCC vaccine measured by SBA

Group and cutoff% Individuals with titers below cutoffPredicted % vaccine efficacy (95% CI)
VaccinatedUnvaccinated
Infants
    1:426.084.069 (50-81)
    1:846.087.647 (29-61)
    1:1652.090.543 (25-56)
    1:3258.093.538 (21-51)
    1:6466.094.730 (15-43)
    1:12872.096.424 (9-36)
Toddlers
    1:415.484.382 (68-90)
    1:824.687.372 (57-82)
    1:1624.691.473 (59-82)
    1:3233.892.964 (49-74)
    1:6447.795.150 (35-61)
    1:12852.396.646 (32-57)