Which pathogen is specifically known to be covered by Vigamox?

Vigamox, a brand name for the antibiotic moxifloxacin, is specifically indicated for treating certain bacterial infections, particularly those affecting the eyes, such as bacterial conjunctivitis. Among the choices presented, Staphylococcus aureus, which is often abbreviated as S. aureus, is a common pathogen that can cause eye infections and is susceptible to treatment with moxifloxacin.

Moxifloxacin belongs to the fluoroquinolone class of antibiotics, known for their broad-spectrum activity against various Gram-positive and Gram-negative bacteria, including S. aureus. This makes it a suitable choice for targeting infections caused by this particular pathogen.

The other pathogens listed have different characteristics or are not the main focus for treatment with moxifloxacin. Strep pyogenes is primarily treated with other antibiotics, Pseudomonas aeruginosa has varying susceptibilities to fluoroquinolones but is not the primary indication for Vigamox, and Clostridium difficile is typically treated with antibiotics such as vancomycin, not moxifloxacin. Thus, S. aureus stands out as the pathogen specifically known to be effectively treated by Vigamox.