Final answer:
Orbital cellulitis is commonly caused by Staphylococcus aureus, with Streptococcus species also being significant contributors.
Step-by-step explanation:
The most common pathogen that causes orbital cellulitis is Staphylococcus aureus. Other commonly implicated bacteria include Streptococcus species. While the provided information discusses the organisms responsible for conditions such as bacterial keratitis and bacterial conjunctivitis, it's important to note that orbital cellulitis is a different condition. Still, similar pathogens like Staphylococcus and Streptococcus can cause a variety of bacterial infections in different parts of the body. When treating streptococcal infections such as cellulitis, penicillin is often prescribed as first-line therapy due to the current susceptibility patterns.
The most common pathogen that causes orbital cellulitis is Staphylococcus aureus. Orbital cellulitis is an infection that affects the tissue around the eye, and it often occurs as a complication of sinusitis or a spreading infection from nearby structures. Staphylococcus aureus is a bacteria that can cause a range of infections, including skin and soft tissue infections.