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Parvovirus infection in pregnant women is associated with hydrops fetalis due to severe fetal anemia, sometimes leading to miscarriage or stillbirth. The risk of fetal loss is about 10% if infection occurs before pregnancy week 20 (esp. between weeks 14-20), but minimal after then. This risk may be reduced with correct diagnosis of the anemia (by ultrasound scans) and treatment (by blood transfusions). Once the baby is born, there is evidence to suggest no developmental abnormalities due to B19 infection during pregnancy.