June is National Congenital Cytomegalovirus Awareness Month. Cytomegalovirus, or CMV is a member of the herpesvirus family. It is incredibly common, between 50 to 80 of people have it by the time they turn 40, and it is mostly harmless to adults. However, it can be very harmful to infants when passed from the mother in pregnancy. This monthly holiday is about raising awareness. There are ways for mothers to prevent passing the virus to their child if they talk to their doctor about the options.