A 1-week-old boy born at full term is brought by his parents to the office with a 2-day history of eye swelling and watery discharge. This morning, the discharge became thick and yellow. On physical exam, he is afebrile and fussy with bilateral eyelid edema, purulent discharge, and erythematous conjunctivae. After taking appropriate cultures of the eyes, which one of the following is the best next step?
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