Infectious mononucleosis. Light micrograph of a blood smear from a patient with infectious mononucleosis (glandular fever). Caused by Epstein-Barr virus (EBV), infectious mononucleosis (mono) is transmitted through saliva. It is often referred to as the 'kissing disease'. It is characterised by enlarged, atypical lymphocytes (one seen at upper centre), a type of white blood cell. A normal lymphocyte is seen at lower centre, the other cells here are red blood cells.
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