Mononucleosis is an infectious disease caused by the Epstein-Barr virus
The disease was first described by the pediatrician Emil Pfeiffer. The disease was named after him and the most common symptoms, fever and swollen lymph nodes. The responsible virus belongs to the herpesviruses and is widespread among the population. After the infection, it remains in the body and is sporadically found in the saliva of symptom-free people. While disease progression in infants often goes unnoticed, it can last up to six months in adolescents..