Fig. 2: Infant positive PCR and IgM results by infant age and maternal gestational age of infection.

Panel (a) depicts positive ZIKV PCR results in serum or urine for unique children. Before 90 days of age, 45 children had positive PCR results. After 90 days of age, 17 children had positive PCR results. The difference in distribution of positive PCR results between both age groups was not statistically significant, p = 0.87. Panel (b) depicts positive ZIKV IgM results. Before 90 days of infant age, 29 infants had positive results. After 90 days of age, 13 children had positive IgM results. The difference in distribution of positive IgM results between both age groups was statistically significant, p = 0.03. The statistical test used for comparison was a two-sided hypothesis Student T-test at the alpha 0.05 level. There were no adjustments for multiple comparisons. Error bars represent the standard deviation.