FCEM2-1363

A 12-year-old boy presents to the eye clinic with a sudden onset of acute follicular conjunctivitis in his right eye. He complains of severe eye pain and has blurred vision with a lot of watery discharge. During the examination, pseudomembrane formation is observed in his eye, and he has preauricular lymphadenopathy on the right side. The doctor informs him that he has been diagnosed with ‘epidemic keratoconjunctivitis’.
What is the SINGLE most likely causative organism in this case?