What viruses can pass through the placenta?

By far, viruses determine the most dangerous type of infection that crosses the placenta barrier. Higher risks occur when the infection starts in the first trimester, as it may affect the baby’s development.

The most dangerous infections transmitted by the placenta are: herpes simplex, viral hepatitis, influenza, mumps, varicella, syphilis, listeriosis, toxoplasmosis or cytomegalovirus infection.

What risks involve infections during pregnancy

For example, if it occurs in the first trimester of pregnancy, rubella can cause miscarriage or deafness.

Hepatitis is transmitted to the fetus, herpes affects the brain, lungs and liver, and the cytomegalovirus increases the risk of premature birth, low birth weight, enlarged liver or spleen.

Toxoplasmosis, although harmless to the mother, can cause severe anomalies in the fetus.

Placenta and viruses