How to recognize a mononucleosis? 

• A fatigue extreme.
• Swelling and tenderness of ganglia neck: many may swell at this level.
• Access from fever up to 40,5 ºC (105 ºF) which is often accompanied by chills. Fever and chills can last one to two weeks!
• Un sore throat pronounced (which can go, in the extreme, to the inability to swallow). The throat is red with white deposits, even membranes.
• Headaches.
• Loss of appetite.
• Sometimes generalized muscle pain and joint pain.
• A rash may appear, most often after taking antibiotics.
• An increase in the volume of the spleen is sometimes noticeable by the doctor (by feeling the abdomen).

The fever and sore throat last 2 to 3 weeks, but fatigue can last for several months.