Final answer:
The nurse would suspect gonorrhea based on the data provided, as it is associated with symptoms of urethritis and is caused by Neisseria gonorrhoeae.
Step-by-step explanation:
The nurse would suspect gonorrhea based on the data provided. Gonorrhea is caused by Neisseria gonorrhoeae and is associated with symptoms of urethritis, such as painful urination and discharge. The clinical photographs and micrograph showing gram-negative diplococci support the diagnosis of gonorrhea in a male patient.