Final answer:
Infectious mononucleosis caused by the Epstein-Barr virus can be diagnosed through a blood smear and the heterophile antibody test. Rest and symptomatic relief are the main forms of treatment. Caution is necessary to prevent splenic hemorrhage or rupture.
Step-by-step explanation:
Infectious mononucleosis, a disease caused by the Epstein-Barr virus, can be diagnosed based on the presence of atypical lymphocytes in a blood smear and a positive result on the heterophile antibody test (Monospot test). Treatment for infectious mononucleosis mainly involves rest and symptom relief. However, caution should be taken to avoid contact sports until the spleen enlargements resolves to prevent splenic hemorrhage or rupture.