- Infants receiving acyclovir expectantly do not qualify for this study because they never developed HSV disease. Expectant therapy describes infants who are cultured at approximately 24 hours of life because of a risk of HSV infection (i.e. they are born to women with active genital lesions). Oftentimes, if these cultures are positive, the infant will receive a course of intravenous acyclovir to prevent the development of HSV disease. However, since they never actually had HSV disease, their potential outcome cannot be compared with infants with typical skin, eyes, and mouth (SEM) disease, and so they are not included in this study.