Eye with conjunctivitis exuding pus
An abscess is an enclosed collection of pus
Duodenoscopy image of hepatopancreatic ampulla with pus extruding from it, indicative of cholangitis

Pus is a viscous exudate, typically whitish-yellow, yellow, or yellow-brown, formed at the site of inflammatory during infection.[1] An accumulation of pus in an enclosed tissue space is known as an abscess, whereas a visible collection of pus within or beneath the epidermis is known as a pustule or pimple.

Pus consists of a thin, protein-rich fluid, known as liquor puris, and dead leukocyte of the body's immune response (mostly neutrophils). During infection, macrophages release cytokines which trigger neutrophils to seek the site of infection by chemotaxis. There, the neutrophils engulf and destroy the bacteria and the bacteria resist the immune response by releasing toxins called leukocidins.[2]. As the neutrophils die of from toxins and old age, they are destroyed by macrophages, forming the viscous pus.

Bacteria that cause pus are called suppurative, pyogenic[3][2], or purulent. If the agent also creates mucus, it is called mucopurulent. Purulent infections can be treated with an 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-green pus is found in certain infections of Pseudomonas aeruginosa as a result of the pyocyanin bacterial pigment it produces; amoebic abscesses of the liver produce brownish pus. Pus can also have a foul odor.

In almost all cases when there is a collection of pus in the body, the clinician will try to create an opening for it to evacuate - this principle has been distilled into the famous Latin aphorism "Ubi pus, ibi evacua!"

Some common disease processes caused by pyogenic infections are impetigo, osteomyelitis, septic arthritis, and necrotizing fasciitis.[4]

Pyogenic bacteria

A great many species of bacteria may be pyogenic. The most commonly found include:[5]

See also


  1. ^ "Pus - Definitions from Dictionary.com". reference.com. http://dictionary.reference.com/browse/Pus. Retrieved 2008-08-18. 
  2. ^ a b Madigan, Michael T. and Martin, John M. Brock Biology of Microorganisms 11th ed. Pearson Prentice Hall. USA. 2006: 734
  3. ^ "pyogenic" at Dorland's Medical Dictionary
  4. ^ "Infections Caused by Common Pyogenic Bacteria", Dermatopathology (Springer Berlin Heidelberg): pp. 83–85, doi:10.1007/3-540-30244-1_12 
  5. ^ Thompson, Alexis; Miles, Alexander (1921). "Pyogenic Bateria". Manual of Surgery. Oxford Medical Publications. http://www.manual-of-surgery.com/content/0013-Pyogenic-Bacteria.html. 

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Look at other dictionaries:

  • pus — pus; pus·tu·lar; pus·tu·la·tion; pus·tu·la·tous; pus·tule; pus·tu·li·form; pus·tu·lose; pus·tu·lous; py·go·pus; rhab·do·car·pus; rhi·zo·pus; ric·cio·car·pus; scal·o·pus; sca·phi·o·pus; sca·pus; scir·pus; sco·pus; sco·pus; seme·car·pus;… …   English syllables

  • pus — [ py ] n. m. • 1520; lat. pus, puris ♦ Production pathologique liquide ou relativement épaisse, le plus souvent jaunâtre, se produisant lors d inflammations et contenant des leucocytes, des débris cellulaires et des micro organismes (lorsqu il s… …   Encyclopédie Universelle

  • pus — s.n. Faptul de a pune. ♦ (pop.) Semănare, plantare. – v. pune. Trimis de oprocopiuc, 13.09.2007. Sursa: DEX 98  PUS adj. aşternut, întins, pregătit. (Îl aşteaptă cu masa pus.) Trimis de siveco, 05.08.2004. Sursa: Sinonime  PUS s. 1. v. plantare …   Dicționar Român

  • Pus — Saltar a navegación, búsqueda El pus es una sustancia blanquecina o amarillenta producida por el cuerpo durante procesos infecciosos. Un absceso es una acumulación de pus en un tejido cerrado, producido en general por una infección bacteriana o… …   Wikipedia Español

  • pus — m. patol. Sustancia semilíquida, opaca y de color amarillento que se forma a consecuencia de una infección. Contiene leucocitos más o menos alterados, gérmenes infecciosos, eritrocitos, células y restos celulares de los tejidos lesionados y suero …   Diccionario médico

  • Puś — Pus ist die lateinische Bezeichnung für Eiter PUS steht für: der IATA.Code für den Flughafen Gimhae in Südkorea Puś ist der Name des Rektors der Universität Łódź Wiesław Puś (*1940) …   Deutsch Wikipedia

  • pus — PUS. s. m. Matiere corrompuë qui se forme dans les parties où il y a inflammation, contusion, playe, abscés, &c. Le pus commence à se former. dés qu on luy eut donné un coup de lancette. le pus sortit en abondance. on luy a tiré du sang qui est… …   Dictionnaire de l'Académie française

  • Pus — ist die lateinische Bezeichnung für Eiter PUS steht für: der IATA.Code für den Flughafen Gimhae in Südkorea Puś ist der Name von Wiesław Puś (*1940), Rektor der Universität Łódź 2002–2008 …   Deutsch Wikipedia

  • pus — ‘Líquido amarillento segregado por un tejido inflamado’. Este sustantivo es masculino en el uso culto de la mayor parte del ámbito hispánico: «El pus [...] puede ocasionar gran tumefacción y dolor» (Tagarano San Bernardo [Arg. 1987]). Su empleo… …   Diccionario panhispánico de dudas

  • Pus — Pus, n. [L., akin to Gr. ?, ?, and to E. foul: cf. F. pus. See {Foul}, a.] (Med.) The yellowish white opaque creamy matter produced by the process of suppuration. It consists of innumerable white nucleated cells floating in a clear liquid. [1913… …   The Collaborative International Dictionary of English

  • pus — late 14c., from L. pus pus (related to puter rotten, see PUTRID (Cf. putrid)), from PIE *pu (Cf. Skt. puyati rots, stinks, putih stinking, foul; Gk. puon discharge from a sore, pythein to cause to rot; …   Etymology dictionary

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