A 5-year-old boy presents with a 3-day history of fever, sore throat, and red, watery eyes. He attends daycare where several other children have similar symptoms. On examination, he has pharyngeal erythema, bilateral conjunctival injection, and cervical lymphadenopathy. A rapid strep test is negative, and a viral PCR panel confirms adenovirus infection. Which condition is most consistent with this presentation?
