Dr. Universe, an informational website project of Washington State University, published the following description of pus (accessed Feb. 1, 2008):

“Pus is made up mostly of a special kind of white blood cell called NEUTROPHILS. Their main job is to eat and digest invading microorganisms such as bacteria. In the process of fighting off infection, they die. So pus is a battleground full of soldiers, living and dead. It also contains bacteria and dead cells from the surrounding tissue.”

Feb. 1, 2008