Table 1. Determination of anti-Toxoplasma gondii antibodies in maternal and umbilical cord serum samples using indirect immunofluorescence (IIF), enzyme-linked immunosorbent assay (ELISA) and an immunoglobulin G (IgG) avidity test, São José do Rio Preto, state of São Paulo, Brazil.

	IIF/ELISA IgG* (n = 174)		IIF IgM (n = 87)		IgG avidity† (n = 174)
	Negative	Positive	Negative	Positive	≤ 15%	16-30%	≥ 30%
Newborn	31	56	Not determined	Not determined	0	2	54
Maternal	31	56	85	2	0	4	52
1st trimester	4	9	13	0	0	0	9
2nd trimester	14	22	36	0	0	2	20
3rd trimester	13	25	36	2	0	2	23

^*P = 1.000

^†P = 0.6788 (calculated by means of Fisher's exact test)

IIF = indirect immunofluorescence; ELISA = enzyme-linked immunosorbent assay; IgG = immunoglobulin G; IgM = immunoglobulin M.