My 26year Old Daughter Has Been Diagnosed With Ebv. She's

My 26year old daughter has been diagnosed with ebv. She's been very ill and in hospital twice with an enlarged spleen, fevers, lungs problem amongst others. My husband donates platelets every 2-4weeks, but has been told he can't donate for 4 months because of contact with her. It seems a long time and no-one seems to know if it is right