A type of injury in which harmful microorganisms, such as bacteria, viruses, or fungi, have invaded the wound site and are causing an inflammatory response that can lead to various symptoms and complications.


An infected wound occurs when harmful microorganisms—such as bacteria, viruses, fungi, or, less commonly, parasites—invade a break in the skin. This triggers an inflammatory response and can interfere with the body’s natural healing process. Wound infections can develop anywhere on the body and may range from mild irritation to severe, potentially dangerous complications if not promptly treated.

What Causes Wound Infections?

Wound infections arise when pathogens enter the body through an opening in the skin. Common sources include:

Bacterial Infection (Most Common)

  • The majority of infected wounds are caused by bacteria such as:
    • Staphylococcus aureus
    • Streptococcus species
    • Escherichia coli
  • Bacteria may enter through contaminated objects, unwashed hands, dirt, or surgical incisions.

Viral Infection

  • Certain viruses, such as herpes simplex virus, can infect open wounds, especially in areas already exposed to the virus.

Fungal Infection

  • Fungi can infect wounds in warm or moist environments.
  • More common in individuals with reduced immunity or chronic conditions.

Parasitic Infection (Rare)

  • Parasites may invade wounds in very rare cases, typically in areas with limited sanitation.

Symptoms of an Infected Wound

Signs of infection may appear within days or develop gradually. Typical symptoms include:

Local Symptoms

  • Increasing pain at the wound site, often worsening instead of improving
  • Redness and swelling, sometimes extending outward from the wound
  • Warmth, with the area feeling hot to the touch
  • Pus or discharge, which may be white, yellow, green, or brown, sometimes accompanied by a foul odor
  • Tenderness or heightened sensitivity around the wound
  • Delayed healing, with the wound failing to close or worsening over time

Systemic Symptoms

These may indicate the infection is spreading beyond the wound:

  • Fever
  • Chills or shivering
  • Fatigue or feeling unwell

Complications such as cellulitis, abscess formation, or bloodstream infection can occur if the infection is not addressed.

Management and Treatment

Prompt attention is essential when a wound shows signs of infection. Treatment may include:

  • Professional cleaning or debridement of the wound
  • Antibiotics, either topical or oral, depending on severity
  • Drainage of pus if an abscess has formed
  • Proper wound care, such as keeping the area clean and covered

Seeking medical care is particularly important for deep wounds, animal or human bites, punctures, or wounds that do not improve. Early treatment helps prevent serious complications and supports faster healing.

Infected Wound
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