Table 1.

Frequency of past and recent dengue infection among parturients and the umbilical cord sera and the Kappa agreement for IgG placental transfer

Dengue infection	Parturients	Cord serum	Kappa
	(n = 505)	(n = 505)
Past Infection
IgG positive (95% CI)	53.9% (49.4–58.3)	55.0% (50.6–59.4)*	0.96
Recent infection
IgM**positive and RT-PCR detection (95% CI)	2.8% (1.4–4.4)	0%	na

* IgG placental transfer.

**IgM positivity: commercial and in house ELISA tests.

na; not applicable.