CAROL AND MIKE WERNER / SCIENCE PHOTO LIBRARY CAROL AND MIKE WERNER / SCIENCE PHOTO LIBRARY
Illustration of Cytomegalovirus (CMV), a common infection that is usually harmless, although once it is present in a person's body, it stays there for life. In the United States 50-80% of adults are infected with CMV by the time they are 40 years old. Most show no symptoms and never know they are infected. CMV, however, can be dangerous for infants and children, causing hearing loss, blindness and developmental problems.
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