Pus 302657 224663086 2008-07-09T21:33:27Z VolkovBot 3035831 robot Adding: [[bg:Гной]] {{Unreferenced|date=January 2008}} {{otheruses}} '''Pus''' is a whitish-yellow or yellow substance produced during [[inflammatory]] responses of the body that can be found in regions of [[pyogenic]] [[bacterium|bacteria]]l [[infection|infections]]. An accumulation of pus in an enclosed tissue space is known as an [[abscess]]. A visible collection of pus within or beneath the [[epidermis (skin)|epidermis]], on the other hand, is known as a pustule or [[pimple]]. Pus is produced from the dead and living [[cells]] which travel into the intercellular spaces around the affected [[cell (biology)|cell]]s. Something that creates pus is called '''suppurative''', '''pyogenic''', or '''purulent'''. If it creates [[mucus]] as well as pus, it is called '''mucopurulent'''. Pus consists of a thin, [[protein]]-rich fluid, known as '''liquor puris''', and dead cells, which are part of the body's innate [[immune response]]. Pus can also appear visibly from pimples. [[Neutrophils]] are produced in the [[bone marrow]] and released into the blood. When the need to fight infection arises, they move to the site of infection by a process known as [[chemotaxis]], usually triggered by [[cytokine]]s released from [[macrophage]]s that sense invading organisms. At the site of infection, they engulf and kill bacteria. Eventually, the neutrophils die, and these dead cells are then [[phagocytosis|phagocytosed]] by macrophages, which break them down further. Pus, therefore, is the viscous material composed of these dead neutrophils. Neutrophils are the most abundant type of [[leukocyte]] in human [[blood]], comprising anywhere between 40% to 75% of leukocytes. When seen in a wound or dry skin, pus indicates the area is infected and should be cleaned with [[antiseptic]]. Despite normally being of a whitish-yellow hue, changes in the color of pus can be observed under certain circumstances. Pus is sometimes green because of the presence of [[myeloperoxidase]], an intensely green antibacterial protein produced by some types of white blood cells. Blue pus is found in certain infections of ''[[Pseudomonas aeruginosa]]'' as a result of the pyocyanin bacterial pigment it produces; [[amoeba|amoebic]] abscesses of the [[liver]], meanwhile, produce brownish pus. Pus might have a reddish tint to it after mixing with blood. Pus can also have a foul odor. == See also == * [[Ubi pus, ibi evacua]] [[Category:Body fluids]] [[ar:قيح]] [[bg:Гной]] [[ca:Pus]] [[cs:Hnis]] [[de:Eiter]] [[et:Mäda]] [[es:Pus]] [[eo:Puso]] [[eu:Zorne]] [[fr:Pus]] [[it:Infiammazione purulenta]] [[he:מוגלה]] [[la:Pus]] [[ms:Nanah]] [[nl:Pus]] [[ja:膿]] [[oc:Pus]] [[pl:Ropa (medycyna)]] [[pt:Pus]] [[qu:Q'iya]] [[ru:Гной]] [[sv:Var (medicin)]] [[tl:Nana]] [[tr:İrin]] [[zh:膿]]