1. Wednesday,
April 12, 2023
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Types of pus
DR. HIWA OMER AHMED
PROFESSOR IN GENERAL AND BARIATRIC
SURGERY
UNIVERSITY OF SULAIMANI
COLLEGE OF MEDICINE – SULAIMANI CITY-
KURDISTAN
2. Wednesday,
April 12, 2023
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Pus
Pus is a whitish-yellow, yellow, or brown-
yellow protein-rich fluid called liquor
puris that accumulates at the site of an
infection.
3. Wednesday,
April 12, 2023
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Overview
Pus is a thick fluid containing
dead tissue, cells (WBC), and
bacteria.
Depending on the location and
type of infection, pus can be
many colors, including white,
yellow, green, and brown.
While it sometimes has a foul
smell, it can also be odorless.
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April 12, 2023
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Color and smell
The whitish-yellow, yellow, yellow-brown, and greenish color of pus is
the result of an accumulation of dead neutrophils.
Pus can sometimes be green because some white blood cells produce a
green antibacterial protein called myeloperoxidase.
Pseudomonas aeruginosa produces a green pigment called
pyocyanin.
Pus from infections caused by P. aeruginosa is particularly foul-smelling.
If blood gets into the affected area, the yellowish or greenish color may
also have tinges of red.
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April 12, 2023
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Pathophysiology of pus formation
When the body detects an infection, it sends neutrophils, to
destroy the fungi or bacteria.
During this process, some of the neutrophils and tissue
surrounding the infected area will die. Pus will accumulate as
the dead material.
Many types of infection can cause pus. Infections involving the
bacteria
Staphylococcus aureus
Streptococcus pyogenes are especially prone to pus.
Both of these bacteria release toxins that damage tissue, creating
pus.
6. Wednesday,
April 12, 2023
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Causes for postoperative suppurations
DM
smoking
obesity
surgical procedures that last for more than two hours
Dysfunctioned immune system
undergoing treatment, such as chemotherapy,
steroid..etc
