High Quality Content by WIKIPEDIA articles! Infectious mononucleosis (also known as EBV infectious mononucleosis or Pfeiffer's disease or Filatov's disease[1] and colloquially as kissing disease from its oral transmission or as mono in North America and as glandular fever in other English-speaking countries) is an infectious, very widespread viral disease caused by the Epstein-Barr virus (EBV), a type of Herpes virus, which well over 90% of all adults are exposed to at some point in their lives.