A 17 year old patient complains of fever, fatigue and sore throat. The clinical examination shows bilateral lymphadenopathy. You notice numerous petechiae on the soft palate and oropharyngeal tonsillar enlargement. What is the most likely diagnosis?

Acute lymphonodular pharyngitis

Infectious mononucleosis.

Herpangina

Non-Hodgkin’s lymphoma

Primary herpetic gingivostomatitis