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TORCH IgM antibody generally appears 1 week after infection and gradually disappears in 4-8 weeks, which is an indicator of recent infection. IgG antibodies typically appear two weeks after infection and persist for many years, an indicator of previous infection.[9]

Toxoplasma Gondii (Toxo) :

Toxo Infection of pregnant women may cause serious consequences to the fetus. Generally, the infection rate of the fetus is low in the first three months of pregnancy (about 17%), and the common symptom is miscarriage. Infection at 4 to 6 months may cause moderate or severe damage to the fetus; The infection rate was higher in late pregnancy (64%), but the fetus had higher resistance and less damage.

Human Cytomegalovirus (CMV) :

CMV is one kind of double-stranded DNA virus. Pregnant women of CMV primary or recurrent infections can cause neonatal intrauterine or perinatal infection, but the harm of primary infection is more serious to fetus than that of recurrence infection. Most congenital infected fetals shows symptom of mental retardation, visually impaired, hearing loss, especially giant cell inclusion body disease (CI, characterized by reticuloendothelial system and invaded the central nervous system), which will cause multiple systems, multiple organ damage to baby.

Rubella Virus (Rubella) :

Rubella is one kind of RNA viruses. During the first 6 months of pregnancy, if pregnant women are infected with Rubella virus, the virus can invade the fetus through the placenta, causing miscarriage and stillbirth, about 29% of the birth baby have "Congenital Rubella Syndrome" (CRS), birth weight less than 2.5 kg, stunted growth; with systemic organ damage, congenital heart disease, deformity, deafness, blindness and so on.

Herpes Simple Virus (HSV)

HSV has two serotypes, namely herpes simplex virus type 1 (HSV-1) and herpes simplex virus type 2 (HSV-2). The transmission routes of the two virus are different: HSV-1 is mainly transmitted by close contact of respiratory tract, skin and mucosa; HSV-2 is transmitted primarily through sex. If the women was primary infected in the first 3-6 months of pregnancy, it will cause congenital infection of the fetus, or abortion, stillbirth, but the probability is very low. If primary infections happens in the last three months of pregnancy, the probability to infect the fetus is about 30-50%.