Infective mononucleosis (mono) is caused by the Epstein–Barr virus (EBV). EBV is transmitted through direct contact with an infected person (kissing, using the same drinking glass). If you’ve been infected with the virus in the past you would not get infected again because you would have developed a life-long immunity against the virus. Once infected with EBV, your body cannot contract the virus again. An EBV-infection, or mononucleosis, is not considered a high risk for damaging a fetus. Some other viruses such as rubella, chickenpox, influenza, cytomegalovirus, herpes simplex, etc. are considered higher risk infections and can create fetal damage during pregnancy. There is nothing you can do if you were infected during contact. You can see a doctor if you start feeling the symptoms of mono: fever, sore throat, fatigue, abdominal pain, etc.