A wound is any injury that damages tissues, while contamination, colonization and infection refer to increasing levels of microbes in a wound. Common causes of wound infections include Staphylococcus aureus, Pseudomonas aeruginosa, and various streptococci. Proper wound sampling and transport is important for laboratory diagnosis to identify causative organisms and guide treatment. Methods include swab collection and transport in sterile containers at proper temperatures until analysis by culture or other tests.