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February 6, 2012
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Scabies

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Doctor to Patient

What Is "Norwegian Scabies"?

Medical Author: Melissa Conrad Stöppler, MD
Medical Editor: William C. Shiel Jr., MD, FACP, FACR

Norwegian scabies is sexually transmitted disease that causes an itchy skin rash.Scabies is a well-known infection that results in a particularly relentless and devastating itch that starts out slowly and increases in severity over time. The mites that cause the condition, scientifically known as Sarcoptes scabiei, burrow into the skin of infected humans. While they are so tiny that it's not possible to see them with the naked eye, they can be appreciated by examination with a magnifying glass or microscope.

Sometimes, doctors or others health-care providers may refer to "Norwegian" scabies, and this term can be confusing. The name seems to imply that the condition is caused by a specific type of mite that is found in Norway or that preferentially affects people of Norwegian descent, neither of which is true. The term "Norwegian scabies" refers instead to a particularly severe form of scabies that is also known as crusted scabies. Crusted scabies has been called Norwegian scabies because the condition was first described in Norway in the mid-19th century.

Garden-variety scabies produces small bumps and blisters in the webs between the fingers, on the wrists, the backs of the elbows, in the groin, on the knees, and on the buttocks.

Doctor to Patient

Scabies facts

  • Scabies is an itchy, highly contagious skin condition caused by an infestation by the itch mite Sarcoptes scabiei.


  • Direct skin-to-skin contact is the mode of transmission.


  • A severe and relentless itch is the predominant symptom of scabies.


  • Sexual contact is the most common form of transmission among sexually active young people, and scabies has been considered by many to be a sexually transmitted disease (STD).


  • Scabies produces a skin rash composed of small red bumps and blisters and affects specific areas of the body.


  • Treatment includes oral or topical scabicidal drugs.

What is scabies?

Scabies is an itchy, highly contagious skin disease caused by an infestation by the itch mite Sarcoptes scabiei. Mites are small eight-legged parasites (in contrast to insects, which have six legs). They are tiny, just 1/3 millimeter long, and burrow into the skin to produce intense itching, which tends to be worse at night. The mites that infest humans are female and are 0.3 mm-0.4 mm long; the males are about half this size. Scabies mites can be seen with a magnifying glass or microscope. The scabies mites crawl but are unable to fly or jump. They are immobile at temperatures below 20 C, although they may survive for prolonged periods at these temperatures.

Scabies infestation occurs worldwide and is very common. It has been estimated that worldwide, about 300 million cases occur each year. Human scabies has been reported for over 2,500 years. Scabies has been reported to occur in epidemics in nursing homes, hospitals, long-term care facilities, and other institutions. In the U.S., it is seen frequently in the homeless population but occurs episodically in other populations of all socioeconomic groups as well.

How do you get scabies?

Direct skin-to-skin contact is the mode of transmission. Scabies mites are very sensitive to their environment. They can only live off of a host body for 24-36 hours under most conditions. Transmission of the mites involves close person-to-person contact of the skin-to-skin variety. It is hard, if not impossible, to catch scabies by shaking hands, hanging your coat next to someone who has it, or even sharing bedclothes that had mites in them the night before. Sexual physical contact, however, can transmit the disease. In fact, sexual contact is the most common form of transmission among sexually active young people, and scabies has been considered by many to be a sexually transmitted disease (STD). However, other forms of physical contact, such as mothers hugging their children, are sufficient to spread the mites. Over time, close friends and relatives can contract it this way, too. School settings typically do not provide the level of prolonged personal contact necessary for transmission of the mites.

Can you catch scabies from a dog or cat?

Dogs and cats are infected by different types of mites than those which infect humans. Animals are not a source of spread of human scabies. Scabies on dogs is called mange. When canine or feline mites land on human skin, they fail to thrive and produce only a mild itch that goes away on its own. This is unlike human scabies which gets worse and worse unless the condition is treated.

Pictures of scabies rash
What does a scabies rash look like?



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Scabies

Itching (itch) facts

  • The medical term for itching is pruritus.
  • Infections, bites and stings, infestations, chronic diseases, sun exposure, and dry skin are among the numerous causes of itching.
  • Anti-itch creams and lotions containing camphor, menthol, phenol, pramoxine (Caladryl, Tronolane), diphenhydramine (Benadryl), or benzocaine can bring relief.
  • Some cases of itching will respond to corticosteroid medications.
  • It is best to avoid scratching and itch when possible to avoid worsening of the condition and disruption of the skin that could lead to bacterial infection.
  • If itching persists with time or worsens, or is associated with skin lesions, consulting a health-care practitioner is advisable.

What is an itch?

Itch is an irritation in the skin that elicits an urge to scratch. Itches are a common problem and can be localized (limited to one area of the bo...

Read the Itching article »







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