Table 1.

Estimates of Vaccine Efficacy Stratified by Baseline Immunity Status for CYD14 and CYD15 Jointly

Serotype	Baseline Seronegative		Baseline Seropositive
	Est. VE, %	(95% CI)	Est. VE, %	(95% CI)
1	15.4	(–23.3 to 45.0)	70.2	(57.4–80.1)
2	–12.5	(–42.2 to 26.8)	67.9	(49.9–82.0)
3	45.3	(–20.2 to 99.7)	77.5	(64.3–90.2)
4	51.2	(20.0–72.8)	89.9	(79.8–99.9)
All	21.9	(–5.5 to 42.6)	75.4	(68.3–81.6)

Country- and serotype-specific baseline hazards were adjusted for baseline immunity status and age group.

Abbreviations: CI, confidence interval; VE, vaccine efficacy.