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Necrotizing Fasciitis: Causes, Symptoms, Diagnosis, Treatment And Prevention
Boldsky | 10th Sep, 2019 11:16 AM

Recently, a 12-year-old girl from Florida, was found fighting for her life after she had contracted a deadly flesh-eating disease known as 'necrotizing fasciitis'. Previously in Jharkhand (India), the disease had affected a 25-day-old born. So what exactly is this deadly disease? Let's have a look at its causes, symptoms, treatment, and prevention.

What Is Necrotizing Fasciitis?

Necrotizing Fasciitis (NF) is a severe skin disease identified by the decaying infection of fasciae, connective tissues of the skin . It is also known as flesh-eating disease which spreads rapidly on their host and causes the death of a person if not treated early. Only rapid antibiotic treatment or surgery can stop the infection from spreading.

There are several bacteria responsible for the spread of NF but medical experts believe that 'Group A Streptococcus' bacteria are highly responsible for the condition . This lethal infection is believed to be affecting people since the fifth century BC during the time of Hippocrates. Earlier in the 18th century, it was known as 'phagedenic ulcer' as it destroys the surrounding tissues but later in the year 1952, this decaying disease was coined as necrotizing fasciitis and since then, its definition became broader. Also, every year in the US, around 500 cases of NF are noticed.

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Types Of Bacteria Causing Necrotizing Fasciitis

There are several bacteria responsible for the spread of NF among which, some of the main ones are as follows:

  • Group A Streptococci: As aforementioned, these Gram-positive bacteria are highly responsible for causing the disease. They are commonly present in the nose, skin, and throat of a person. Group A Streptococci bacteria are the one responsible for the cause of strep throat but when they get inside the skin through wounds, they start spreading and causes NF .
  • Vibrio vulnificus: These Gram-negative bacteria are found in marine environments like oceans, brackish ponds and estuaries. They enter through the injured skin or break in the skin while swimming in the infected water bodies.
  • Escherichia coli: These Gram-negative bacteria are found in the colon or large intestine. Sometimes, they are helpful as they restrict the entry of other bacteria in the intestine while in other scenarios, they harm us by causing food poisoning. In case the bacteria comes outside the intestine, they spread and cause NF .
  • Bacteroides: These Gram-negative bacteria are found mainly in the intestines, mouth, and genitals of a person. They usually benefit a human but in conditions like perforated bowel (hole in the walls of the intestine), mistakenly they come out and cause NF by entering through the skin injury .
  • Prevotella: These Gram-negative bacteria are present all over the body. When other NF-causing bacteria attacks the body, they add up to it and cause serious infection. Prevotella usually targets the neck, jaw, mouth, and face .
Causes Of Necrotizing Fasciitis

NF is caused either by a single bacterium or more than one bacterium. These bacteria affect the connective tissues that lie beneath the skin. If a person has cut, wound, or external injury in their body, the bacteria find their way through these passages and enter the body of a person.

After entering the body, they spread through the tissues and while spreading, they produce two toxins (endotoxin and exotoxin) which obstruct the blood supply to the tissues. Due to this, tissues become impaired of blood supply which further restricts the passage of antibodies to the affected area. This causes the decaying of the tissues.

The infection spreads in four types which are as follows:

  • Type 1 is spread by a combination of gram-positive cocci (like Group A Streptococci) , gram-negative rods (Escherichia coli) , and anaerobes (Bacteroides) bacteria
  • Type 2 is spread alone by Group A Streptococci
  • Type 3 is spread by Vibrio vulnificus
  • Type 4 is mainly fungal and caused by Candida

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Symptoms Of Necrotizing Fasciitis

The first symptoms of NF may be confusing as an infected person may get skin redness, muscle pull, or common flu symptoms. Slowly, the skin area will become painful and if there's a bump on the skin, it will start expanding and decaying. Other symptoms of NF include

  • Fever with chills
  • Low blood pressure
  • Vomiting
  • Nausea
  • Skin lesions like blisters and black dot
  • Extreme pain in the infection area
  • Dizziness
  • Fatigue
  • Weakness
  • Dehydration
  • Diarrhoea
Risk Factors Of Necrotizing Fasciitis

Though NF can affect any individual, people who are at higher risk of the disease are as follows:

  • Alcoholics or drug-consuming individuals
  • Older people
  • Individuals with weak immunity
  • Diabetics
  • Skin infection
  • People with a chronic disease
  • People who have undergone recent surgery
  • Women during childbirth
  • Obese people
Complications Of Necrotizing Fasciitis

The complications associated with NF are very serious and they include the following:

  • Organ failure
  • Sepsis, a kind of blood infection
  • Loss of limbs due to surgery of the large spread infection
  • Death
Diagnosis Of Necrotizing Fasciitis

The diagnosis of NF should be done as early as possible to prevent the spread of the infection and improve the survival rate of a person. Diagnosis of NF is carried out by the following tests:

  • Laboratory blood testing to rule out other skin infections
  • CT scan to see changes on the skin
  • MRI to check for fascial thickening due to the infection
  • Intra-operative biopsy to check for foul smell or bleeding loss by the bacteria
  • Tissue cultures on the infected body tissues
Treatment Of Necrotizing Fasciitis

The treatment of NF include the following therapies:

  • Antibiotic therapy: The treatment helps control sepsis and restrict the spread of the infection. Antibiotics like vancomycin and daptomycin are recommended for the treatment.
  • Surgical debridement: In this treatment, dead and infected tissues are removed to control the infection and let healthy tissues heal and grow more effectively. The treatment also works in preventing the infection from spreading to other organs .
  • Immune globulin (IVIG) therapy: Immunoglobulins are the antibodies found in animals which help fight against bacteria and viruses. The treatment is based on a concept that these antibodies can bind exo-toxins produced by the flesh-eating bacteria. However, the effectiveness of the treatment is still controversial.
  • Hyperbaric oxygen therapy (HBO): This treatment method is used to inhibit the infection and exotoxin produced by them in hyperbaric conditions, exposing the wound to a 100% oxygen environment to speed up their healing. HBO is still controversial in treating NF.
How To Prevent Necrotizing Fasciitis

NF is not contagious. However, a person should take certain preventive measures. They are as follows:

  • Clean all the minor cuts and injuries as soon as you get them.
  • Don't go into swimming pools or water bodies with an open wound or any skin infection.
  • Apply bandage to the injury to cover it.
  • If there's a severe wound on your skin, consult a doctor immediately.
  • If you are punctured by any marine creature like a stingray, get early medical assistance .
  • Be cautious of any fungal infection like athlete's foot.
  • Avoid visiting marine areas where the disease occurrence is high.
   
 
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