Is staphylococcal infection caused by a virus or bacteria?

Bacteria. Staphylococcus is a genus of bacteria and is the cause of a wide variety of infections.
Bacteria. Staphylococcus is a bacteria not a virus. Since it is a bacteria, it can be treated with antibiotics.

Related Questions

How is blepharitis caused by staphylococcal infection?

Skin=staph. Staph is a ubiquitous organism on the skin...Everyone has it. It takes advantage of a small break in the skin or perhaps a plucked eyelash follicle to cause an infection. It is generally easy to treat. See your doctor for antibiotics. Read more...
Dual inflammation. Staph infections can cause primary inflammation and then secondary reaction to the staph toxin especially from this bacteria. The eyelid margin skin is very thin and super-sensitive to irritants and infection. Read more...