https://ift.tt/2wwdHAe My Daughter Has Mono. Is the Whole Family at Risk? Mononucleosis, Fever, Viruses By midlife, the vast majority of adults are immune to the virus that causes mononucleosis. RONI CARYN RABIN https://ift.tt/2KvxUvO June 29, 2018 at 05:30AM