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In page Congenital cytomegalovirus infection:

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Visually healthy infants are not routinely tested for CMV infection although only 10–20% will show signs of infection at birth[citation needed] though up to 80% may go onto show signs of prenatal infection in later life. If a pregnant woman finds out that she has become infected with CMV for the first time during her pregnancy, she should have her infant tested for CMV as soon as possible after birth.[citation needed]