Mono usually is caused by the Epstein-Barr virus (EBV), a very common condition that most kids are exposed to at some point while growing up. Infants and young kids with EBV typically have very mild symptoms or none at all. But teens and young adults who become sick of it often develop mono. Mono usually is most often seen in teens and young adults. it often goes unnoticed because their symptoms are mild.
Mono can be spread through contact with saliva, mucus from the nose and throat, and sometimes tears. Because the germs can be spread through kissing, it has earned the nickname the “kissing disease.” If you have mono, you can avoid passing the virus to others by not kissing and not sharing things like drinking glasses, eating utensils, or toothbrushes. The most common symptoms of mono may include high fever, a severe sore throat, swollen lymph nodes (sometimes called swollen glands) and tonsils, and weakness and fatigue