Table 5. Primary Infections by the Trimester in Which IgM Was Detected.

	I trimester	II trimester	III trimester	Total
IgM+ IgG+ (low or borderline avidity)	9 (81.8%)	1 (9.1%)	1 (9.1%)*	11
IgM+ IgG-	3 (50%)	0	3 (50%)**	6
Total	12 (70.6%)	1 (5.9%)	4 (23.5%)	17

*seroconversion

**two seroconversions