You will see that some sperm is CMV positive:

Cytomegalovirus, or CMV, is a member of the herpes virus family that includes cold sores, chicken pox, and infectious mononucleosis. It is a common virus that affects 50 to 85% percent of American adults. There is currently no vaccine for CMV. Donor eggs have no risk of passing CMV through an egg, however there is a slight risk of passing CMV through the sperm.

If you have been tested and found positive for CMV you may select a sperm donor who is CMV positive.  If you do not know your CMV status you should either get tested or select a sperm donor that is CMV negative.

CMV causes more birth defects and congenital disabilities than many other well-known diseases.  It is important to understand the risks and realities of CMV. 

https://www.seattlespermbank.com/what-is-cmv-and-how-can-it-affect-my-pregnancy/