Zirgan is an antiviral drug that slows the growth and spread of cytomegalovirus (CMV). Zirgan eye drops are used to treat keratitis caused by the herpes simplex virus in adults and children 2 years of age and older.

The cause of diarrhea can be bacteria or viruses. The etiology of diarrhea may depend on age and immune status. Diarrhea in immunocompromised people such as the elderly, those with underlying diseases (kidney failure, high blood pressure, diabetes, cancer, etc.) can be caused by many factors. Among them, Cytomegalovirus is often overlooked.