Diagnosis of fetal infection has depended on identification of pathogens by means of microbiological cultures, immunologic techniques, and special molecular biology techniques that can identify organisms known or suspected of being associated with adverse outcomes of pregnancy. Rubella, cytomegalovirus (CMV), herpes simplex virus (HSV), and human immunodeficiency virus (HIV), for example, are capable of gaining access to the amniotic cavity and producing fetal infection, even when amniotic membranes are intact. Intrauterine invasion by viruses can be associated with maternal symptoms of infection or can be completely silent.
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