Table 3.
Distribution of Serum Samples by Infant Age at the Time of Blood Collection
| Age at Sample Collection, mo | |||||||
|---|---|---|---|---|---|---|---|
| Samples | 0–3 | 3–6 | 6–9 | 9–12 | 12–18 | >18 | No. of Infants (%) |
| Serum samples, No. of infants | |||||||
| 1st | 42 | 30 | 8 | 5 | 7 | 6 | 98 (100) |
| 2nd | 3 | 18 | 10 | 15 | 10 | 9 | 65 (66.3) |
| 3rd | 0 | 2 | 5 | 10 | 8 | 11 | 36 (36.7) |
| 4th | 0 | 0 | 0 | 3 | 4 | 10 | 17 (17.3) |
| 5th | 0 | 0 | 0 | 0 | 2 | 6 | 8 (8.1) |
| 6th | 0 | 0 | 0 | 0 | 1 | 1 | 2 (2.0) |
| 7th | 0 | 0 | 0 | 0 | 0 | 2 | 2 (2.0) |
| No. of samples | 45 | 50 | 23 | 33 | 32 | 45 | 228 |
| No. of infantsa | 42 | 48 | 22 | 33 | 31 | 36 | … |
| No. of unique infants testedb | 72 | 47 | 55 | … | |||
The number of serum samples obtained per infant varied from 1 to 7. All infants (n = 98) had at least 1 sample collected during the study, while 65 children (66.3%) had 2 samples, and 36 (36.7%) had 3 or more consecutive serum samples, resulting in a total of 228 samples.
Abbreviation: VNT, virus neutralization test.
aNumber of infants tested by Zika VNT according to age at the time of sample collection.
bNumber of unique infants tested by Zika VNT according to age at the time of sample collection: before 6 months of age, from 6 to 12 months, and above 12 months of age.