**Core Concept**
The question is testing the ability to identify an organism that can infect the eye through an intact cornea, which is a specific aspect of ophthalmology and infectious diseases. This requires knowledge of the virulence factors and modes of entry of various pathogens.
**Why the Correct Answer is Right**
Neisseria gonorrhoeae is the correct answer because it is a highly virulent bacterium that can penetrate intact corneas, leading to gonococcal conjunctivitis. This is due to its ability to attach to and invade corneal epithelial cells through specific adhesins and porins. The bacteria can cause severe damage to the cornea and surrounding tissues, leading to vision loss if left untreated.
**Why Each Wrong Option is Incorrect**
**Option A:** Herpes simplex virus (HSV) typically enters the eye through a break in the epithelium, such as a corneal scratch or abrasion, rather than an intact cornea.
**Option B:** Pseudomonas aeruginosa is an opportunistic pathogen that typically infects compromised corneas, such as those with a history of trauma or previous surgery.
**Option C:** Staphylococcus aureus is a common cause of bacterial conjunctivitis but typically enters the eye through the conjunctival sac rather than penetrating an intact cornea.
**Clinical Pearl / High-Yield Fact**
Neisseria gonorrhoeae is a highly contagious and virulent bacterium that can cause severe eye infections, making prompt diagnosis and treatment essential to prevent vision loss.
**Correct Answer:** C.
Free Medical MCQs Β· NEET PG Β· USMLE Β· AIIMS
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