Pus
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2008-07-09T21:33:27Z
VolkovBot
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robot Adding: [[bg:Гной]]
{{Unreferenced|date=January 2008}}
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'''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]]
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[[ca:Pus]]
[[cs:Hnis]]
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[[eu:Zorne]]
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[[it:Infiammazione purulenta]]
[[he:מוגלה]]
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[[pl:Ropa (medycyna)]]
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