A patient presents to the emergency room with noticeable red…

A patient presents to the emergency room with noticeable red maculopapular exanthem on their head, trunk, and limbs. They had complaints of a sore throat, dry cough, conjunctivitis, and oral lesions (Koplik’s spots) days before.  Inspection of vaccination records shows the patient has not received the MMR vaccine. What could this pathogen be?