What is Kuru Disease Its Cause Symptoms and Mode of Transmission
Kuru disease is commonly found in people of New Guinea who practice cannibalism, a disease in which they eat the brains of dead people. It is also known as a laughing death disease because it can make people laugh until they die. This disease caused havoc in the early 1900s. At present, there is not any known case of this disease.
What is Kuru Disease?
Kuru disease is a highly lethal, rare, incurable, and neurodegenerative disease caused by abnormally folded proteins called prions. The word kuru means “shaking”, which is the main symptom of this disease.
Kuru Disease Symptoms and Signs
Difficulty in walking.
Headache.
Swallowing difficulty, also known as dysphagia, may lead to malnutrition.
Tremors and muscle jerks.
Loss of coordination.
Dysarthria means difficulty pronouncing words.
Secondary infections.
Abrupt obsessive laughing and crying.
Causes of Kuru Disease
The main causing agent of this disease is a prion, which is an abnormally folded protein.
Kuru disease relates to a class of diseases known as transmissible spongiform encephalopathy, also known as prions disease, that especially affects the cerebellum.
This disease can be caused by eating the brain of the infected brain or by coming in contact with an infected wound.
Diagnosis of Kuru Disease
Neurological Examination - This includes medical history, neurological function test, and blood test.
Electroencephalogram - This test is used to examine the brain's electrical activity.
Kuru Disease Treatment
There is not any successful treatment for the kuru disease.
Only by preventing the activity of cannibalism can we prevent this disease.
We can only give symptomatic treatment to relieve symptoms but can't cure the disease completely.
Stop people from eating brains.
Precaution to Stop Kuru Disease
Interesting Facts About Kuru Disease
The incubation period of kuru disease is 10-13 years.
Women and children are mostly affected by this disease because men are used to eating muscle components of the human body, while children and women are used to eating the brains of human corpses as a part of their ritual.
People can survive only for 6-12 months after the first symptom of this disease.
The last case of kuru was seen in 2006.
Kuru disease is also known as laughing death disease because this disease makes us laugh until we die, thus, leading to death.
Important Questions
Why is there no successful treatment of Kuru?
Ans: Kuru disease is caused by prions, and it is very difficult to kill prions; they can't be easily destroyed. They can't even be killed with formaldehyde. Prions are not living organisms, so it is very difficult to kill them.
Kuru disease is caused by which agent?
Ans: Kuru disease is caused by abnormally folded proteins known as prions. These infectious agents are only made up of protein without genetic material.
What are prions?
Ans: Prions are abnormally folded proteins that can cause disease in humans and animals by activating normal healthy proteins in the brain to fold abnormally.
Summary
Kuru disease is a very rare disease caused by prions. Its average incubation period is 10-13 years, but in some cases, it may be 50 years or above. There is no known treatment for this disease, only inhibiting the practice of cannibalism can prevent the spreading of this disease. At present, there is not any known case of this disease; the last case was identified in 2006.
Practice Questions
Q1. What do prions do to humans?
Q2. What are examples of prions?
Q3. How do humans get kuru disease?
Q4. Are prions a living thing?
Q5. What is the difference between viroids and prions?
FAQs on Kuru Disease in Humans Causes Symptoms and Transmission
1. What is Kuru disease?
Kuru disease is a rare, fatal prion disease that affects the human brain and causes progressive neurological damage. It is classified as a type of transmissible spongiform encephalopathy (TSE), characterized by sponge-like degeneration of brain tissue. Kuru was historically found among the Fore people of Papua New Guinea and is known for symptoms such as tremors, loss of coordination, and uncontrollable laughter.
2. What causes Kuru disease?
Kuru disease is caused by infectious misfolded proteins called prions. These abnormal prion proteins induce normal brain proteins to misfold, leading to brain cell damage and degeneration. The disease spreads when infected brain tissue containing prions enters the body, allowing the abnormal proteins to accumulate in neural tissue.
3. How is Kuru transmitted?
Kuru is transmitted through ingestion of infected human brain tissue containing prions. The main mode of transmission occurred during ritualistic cannibalism practiced by the Fore tribe.
- Consumption of infected nervous tissue allowed prions to enter the body.
- Prions crossed into the bloodstream and reached the brain.
- They triggered progressive neurodegeneration.
4. What are the symptoms of Kuru disease?
The main symptoms of Kuru disease are progressive loss of coordination, tremors, and neurological decline. The disease typically progresses in stages:
- Ambulant stage: difficulty walking, poor coordination, mild tremors.
- Sedentary stage: inability to walk without support, severe tremors, emotional instability.
- Terminal stage: inability to sit or swallow, severe neurological impairment, and eventual death.
5. What is the incubation period of Kuru?
The incubation period of Kuru can range from 5 to over 30 years. This unusually long incubation period means individuals may show no symptoms for decades after exposure to prions. Once symptoms appear, the disease progresses rapidly, usually leading to death within about one year.
6. How does Kuru affect the brain?
Kuru affects the brain by causing spongiform degeneration due to accumulation of abnormal prion proteins. These prions:
- Trigger misfolding of normal brain proteins.
- Cause neuronal cell death.
- Create microscopic holes in brain tissue, giving it a sponge-like appearance.
7. Is Kuru disease contagious?
Kuru is infectious through specific exposure to infected tissue but is not contagious through casual contact. Transmission requires direct ingestion or exposure to brain or nervous system tissue containing infectious prions. It does not spread by air, touch, or everyday social interaction.
8. What is the difference between Kuru and Creutzfeldt-Jakob disease?
Kuru and Creutzfeldt-Jakob disease (CJD) are both prion diseases, but they differ in origin and transmission.
- Kuru: transmitted through ritualistic cannibalism; historically limited to Papua New Guinea.
- CJD: usually sporadic, inherited, or acquired through medical exposure; occurs worldwide.
9. Is there a cure or treatment for Kuru?
There is currently no cure or effective treatment for Kuru disease. Management is supportive and focuses on relieving symptoms such as difficulty swallowing and movement problems. Because prion-induced brain damage is irreversible, prevention of exposure to infectious prions is the only effective control measure.
10. Why is Kuru important in biology?
Kuru is important in biology because it helped scientists understand the role of prions as infectious proteins. Research on Kuru demonstrated that diseases can be caused by misfolded proteins without DNA or RNA. This discovery advanced knowledge of protein misfolding, neurodegeneration, and other prion diseases such as Creutzfeldt-Jakob disease and mad cow disease.
