Leprosy

(Redirected from Leper)

Categories: Infectious diseases

Leprosy
ICD-10 code: A30
ICD-9 code: 030
This article is about the infectious disease also known as Hansen's disease. For the malady found in the Hebrew Bible, see the article Tzaraas. For the album Leprosy by Death see the article Leprosy (album).
Image:FatherDamien.jpeg
Father Damien was a Roman Catholic missionary who helped lepers on Hawaii and also died of the disease.

Leprosy, sometimes known as Hansen's disease, is an infectious disease caused by Mycobacterium leprae, an aerobic, acid fast, rod-shaped mycobacterium. The modern term for the disease is named after the discoverer of the bacterium, Gerhard Armauer Hansen.

Sufferers of Hansen's disease have historically been known as lepers, however this term is falling into disuse as a result of the diminishing number of leprosy patients and the pejorative connotations of the term. The terms "leprosy" and "lepers" can also lead to public misunderstanding because the Bible uses these terms in reference to a wide range of incurable skin conditions other than Hansen's disease.

Historically, leprosy was an incurable and disfiguring disease. Lepers were shunned and sequestered in leper colonies. Today, leprosy is easily curable by multidrug antibiotic therapy. The main challenges in the eradication of Hansen's disease is in reaching populations that have not yet received multidrug therapy services, improving detection of the disease, and providing patients with high-quality services and affordable drugs.

Other than humans, the only animals known to be susceptible to leprosy are the armadillo and mice (on their footpads).

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History

Hansen's disease has been recognized as a problem since the beginning of recorded history. It has been reported as early as 1350 BC in Egypt, making it the oldest disease known according to Guinness World Records. Lepers have frequently lived on the edge of society, and the disease was believed for a long time to have been caused by a divine (or demonic) curse or punishment. However, in the Middle Ages it was believed that lepers are cursed by humans, but loved by God.

During the Middle Ages, it was believed that leprosy was highly contagious and could be spread by the glance of a leper or an unseen leper standing upwind of healthy people. Nowadays, it is known that leprosy is much less contagious.

Minorities like the Navarrese agotes or French cagots were accused of being lepers.

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Clinical features

The disease is caused by a mycobacterium which multiplies very slowly and mainly affects the skin, nerves, and mucous membranes. The organism has never been grown in bacteriologic media or cell culture, but has been grown in mouse foot pads and more recently in nine-banded armadilloes. It is related to M. tuberculosis, the mycobacterium that causes tuberculosis. The difficulty in culturing the organism appears to be due to the fact that the organism is an obligate intra-cellular parasite that lacks many necessary genes for independent survival. This loss of genes is apparently also the reason for the extremely slow replication rate.

The mode of transmission of Hansen's disease remains uncertain. Most investigators think that M. leprae is usually spread from person to person in respiratory droplets. What is known is that the transmission rate is very low. In addition, it appears that a majority of the population is naturally immune. Also, contrary to popular belief, Hansen's disease does not cause rotting of the flesh; however, due to nerve damage, extremities may become numb which may lead to minor infected wounds being unnoticed until damage is permanent.

This chronic infectious disease usually affects the skin and peripheral nerves but has a wide range of possible clinical manifestations. Patients are classified as having paucibacillary (tuberculoid leprosy) or multibacillary Hansen's disease (lepromatous leprosy). Paucibacillary Hansen's disease is milder and characterized by one or more hypopigmented skin macules. Multibacillary Hansen's disease is associated with symmetric skin lesions, nodules, plaques, thickened dermis, and frequent involvement of the nasal mucosa resulting in nasal congestion and epistaxis (nose bleeds).

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Incidence

According to recent figures from the World Health Organization (WHO) new cases detected worldwide has decreased by approximately 107,000 cases or 21% from 2003 to 2004. This decreasing trend has been consistent for the past three years. In addition the "global registered prevalance" of leprosy was 286,063 cases with 407,791 new cases being detected during 2004.

In 1999, the world incidence of Hansen's disease was estimated to be 640,000; and in 2000, 738,284 cases were identified. In 1999, 108 cases occurred in the United States. In 2000, the World Health Organization (WHO) listed 91 countries in which Hansen's disease is endemic, with India, Myanmar, and Nepal having 70% of cases. In 2002, 763,917 new cases were detected worldwide, and in that year the WHO listed Brazil, Madagascar, Mozambique, Tanzania and Nepal as having 90% of Hansen's disease cases.

Worldwide, one to two million people are permanently disabled because of Hansen's disease. However, persons receiving antibiotic treatment or having completed treatment are considered free of active infection.

Hansen's disease is one of the infectious diseases tracked passively by the Centers for Disease Control and Prevention. Its prevalence in the United States has remained low and relatively stable. There are decreasing numbers of cases worldwide, though pockets of high prevalence continue in certain areas such as Brazil, South Asia (India, Nepal), some parts of Africa (Tanzania, Madagascar, Mozambique) and the western Pacific.

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Risk groups

Those having close contacts with patients with untreated, active, predominantly multibacillary disease, and persons living in countries with highly endemic disease are at risk of contracting the disease. Recent research suggests that there is genetic variation in susceptibility. The region of DNA responsible for this variability is also involved in Parkinson's disease, giving rise to current speculation that the two disorders may be linked in some way at the biochemical level.

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Asylums

There are still a few leper colonies around the world, in countries such as India and the Philippines.

Western humanitarian and church organizations regularly send relief supplies, including handmade "leper bandages" to these colonies. Leper bandages are knitted or crocheted out of cotton, for better breathing than traditional gauze, and more durability—the bandages can be washed, sterilized, and reused. The bandages can be machine made, but the colony inhabitants appreciate handmade bandages.

In 2001, government-run leper colonies in Japan came under judicial scrutiny, leading to the determination that the Japanese government had mistreated the patients, and the District Court ordered Japan to pay compensation to former patients. [1] In 2002, a formal inquiry into these colonies was set up, and in March of 2005, the policy was strongly denounced. "Japan's policy of absolute quarantine... did not have any scientific grounds." Many children of those with Hansen's disease were executed by staff at colonies up to the 1950s. [2]

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Famous Lepers

Baldwin IV, King of Jerusalem

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See also

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References

  • Icon Health Publications. Leprosy: A Medical Dictionary, Bibliography, and Annotated Research Guide to Internet References. San Diego: Icon Health Publications, 2004. ISBN 0597840067.
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External links


zh-min-nan:Hansen ê pīⁿ da:Spedalskhed de:Lepra es:Lepra eo:Lepro fr:Lèpre he:צרעת ms:Penyakit kusta nl:Lepra ja:ハンセン病 no:Spedalskhet pl:Trąd pt:Hanseníase ru:Лепра su:Lépra fi:Lepra sv:Lepra vi:Bệnh phong zh:麻瘋病