My child complain sever tonsilitis with occipital and groin lymphadenopathy. CBC normal with mild lyphocytosis ; the blood film have change lymph cell?

? Infectious mononucleosis. a viral disease affecting lymphoid tissues all over the body, and resembling bacterial tonsillitis, can give the blood picture you described, please keep the follow up with your doctor who definitely would judge better with more data and physical exam, wish your child speedy recovery.