TABLE 1.

Median anti-VZV antibody titers and proportions of newborn infants with anti-VZV antibody titers above the 150-mIU/ml threshold according to age

Age group (mo)No. (%) in groupMean (95% CI) anti-VZV antibody titer (mIU/ml)% of infants with an antibody titer of ≥150 mIU/ml (95% CI)
0-348 (13.9)333.8 (253-440)83.3 (69.8-92.5)
3-644 (12.8)83.6 (63.4-110)29.5 (16.8-45.2)
6-994 (27.2)25.9 (22.5-29.8)1.1 (0-5.8)
9-12114 (33.0)21.6 (19.1-24.5)3.5 (1.0-8.7)
≥1245 (13.0)22.1 (16.9-28.7)2.2 (0.1-11.8)