More commonly known as human herpesvirus 5 or HCMV, cytomegalovirus is the most frequently transmitted intrauterine infection and can result in serious disabilities at birth, though most people will exhibit only mild symptoms or none at all.

About 1 in 150 children is born with congenital CMV, and 1 in 750 children suffers from permanent disabilities due to the infection. This multicolor immunofluorescence image shows human endothelial cells being infected by cytomegalovirus.