Mono usually resolves spontaneously after one to two weeks without treatment.
The cause of infectious mononucleosis is a virus called the Epstein-Barr virus , named after its discoverers. The Epstein-Barr virus is a member of the Herpes virus family, a group that also causes cold sores, genital herpes, chicken pox and shingles. Sometimes, other symptoms are present, including a rash or abdominal pain due to an enlarged spleen or liver inflammation. Sometimes antibiotics are prescribed mistakenly by the physician, who can easily be fooled into thinking Strep throat is present. You should always let your doctor know if you develop a rash when given an antibiotic.