TABLE 1.
Study groups
| Group | No. | Description and pregnancy outcome (no.) |
|---|---|---|
| 1 | 25 | Maternal B19 infection; IgM seroconversion |
| Good fetal outcomea (6) | ||
| Poor fetal outcomeb (19) | ||
| 2 | 20 | Nonimmune hydrops fetalis of known, noninfectious etiology |
| 3 | 8 | Healthy term delivery or first-trimester elective abortion |
a
Defined as delivery of a healthy term or near-term infant, lacking signs of anemia or nonimmune hydrops fetalis.
b
Defined as a pregnancy ending in spontaneous abortion, nonimmune hydrops fetalis, or fetal death due to B19.