A 1-day-old female newborn is brought for evaluation in the community hospital's postnatal ward due to concerns about her eyes. She was born at term via an uncomplicated vaginal delivery, and ocular prophylaxis with 2% silver nitrate was administered shortly after birth. Her parents note mild redness and a thin, watery discharge from both eyes that began a few hours ago. She is afebrile and feeding well, with no observed skin lesions or other signs of systemic illness. Physical examination reveals bilaterally injected conjunctiva and a minimal watery discharge. The eyelids appear mildly edematous but without significant purulence. The mother’s prenatal history is notable for a treated Chlamydia trachomatis infection identified and successfully managed in the early second trimester. Based on these findings, what is the most likely diagnosis and the recommended initial management?

A 4-day-old male neonate presents to a community health center with bilateral eye redness and profuse, purulent discharge. His parents report the onset of symptoms was rapid, occurring within the last 24 hours. The mother received limited antenatal care and the delivery occurred at home. On examination, the eyelids are significantly edematous, and there is marked chemosis. A Gram stain of the ocular discharge reveals numerous polymorphonuclear leukocytes and intracellular Gram-negative diplococci. Laboratory investigations show a white blood cell count of 18.5 x 10^9/L and C-reactive protein of 15 mg/L. What is the most likely diagnosis and the most appropriate immediate intervention?