DEAR DOCTOR K: At a recent pregnancy checkup, my doctor said something about cytomegalovirus. What is that, and what does it have to do with pregnancy?
DEAR READER: Cytomegalovirus (CMV) is one of eight members of the family of human herpesviruses. The first two members are the viruses that cause "herpes" sores of the mouth, genitals and other areas. All of the herpesviruses cause a lifelong infection. Once you are infected with CMV, it always remains in your body, generally causing no trouble. Up to 85 percent of adults in the United States have been infected.