TABLE 1.

General Characteristics of Study Population

Characteristicn (at Risk*)
Mothers43
Neonates221
Ethnic background
 White171
 Nonwhite50
Birth
 Single181
 Multiple
  Twins (17)34
  Triplets (2)6
Birth weight (g)
 ≤100035 (35)
 1000–149972 (9)
 1500–249954 (0)
 ≥250060 (0)
Gestational age (wk)
 <2823 (23)
 28–3185 (21)
 32–3666 (0)
 ≥3747 (0)
Postnatal age at first serum sampling (d)
 0–3127
 4–742
 8–1416
 15–2112
 22–288
 28–7016
Transfusion(s) before first sample
 Yes76
 No145
VZV-IgG titer
 Positive167
 Negative54
Neonates included in follow-up study30
Duration of follow-up (d)
 Mean52
 Median47
 Range15–98
  • * According to the CDC.16