Kuru is a rare, incurable, and fatal neurodegenerative disorder that was formerly common among the Fore people of Papua New Guinea. Kuru is a form of transmissible spongiform encephalopathy (TSE) caused by the transmission of abnormally folded proteins (prions), which leads to symptoms such as tremors and loss of coordination from neurodegeneration.
The term kuru derives from the Fore word kuria or guria ("to shake"), due to the body tremors that are a classic symptom of the disease. Kúru itself means "trembling". It is also known as the "laughing sickness" due to the pathologic bursts of laughter which are a symptom of the disease. It is now widely accepted that kuru was transmitted among members of the Fore tribe of Papua New Guinea via funerary cannibalism. Deceased family members were traditionally cooked and eaten, which was thought to help free the spirit of the dead. Women and children usually consumed the brain, the organ in which infectious prions were most concentrated, thus allowing for transmission of kuru. The disease was therefore more prevalent among women and children.
The epidemic likely started when a villager developed sporadic Creutzfeldt–Jakob disease and died. When villagers ate the brain, they contracted the disease and then spread it to other villagers who ate their infected brains.
While the Fore people stopped consuming human meat in the early 1960s, when it was first speculated to be transmitted via endocannibalism, the disease lingered due to kuru's long incubation period of anywhere from 10 to over 50 years. The epidemic finally declined sharply after half a century, from 200 deaths per year in 1957 to no deaths from at least 2010 onwards, with sources disagreeing on whether the last known kuru victim died in 2005 or 2009.
Kuru, a transmissible spongiform encephalopathy, is a disease of the nervous system that causes physiological and neurological effects which ultimately lead to death. It is characterized by progressive cerebellar ataxia, or loss of coordination and control over muscle movements.
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Endocannibalism is a practice of cannibalism in one's own locality or community. Endocannibalism has also been used to describe the consumption of relics in a mortuary context. Herodotus (3.38) mentions funerary cannibalism among the Callatiae, a tribe of India. It is believed that some South American indigenous cultures, such as the Mayoruna people, practiced endocannibalism in the past. The Amahuaca Indians of Peru picked particles of bone out of the ashes of a cremation fire, ground them with corn, and drank them as a kind of gruel.
The Fore (ˈfɔːreɪ) people live in the Okapa District of the Eastern Highlands Province, Papua New Guinea. There are approximately 20,000 Fore who are separated by the Wanevinti Mountains into the North Fore and South Fore regions. Their main form of subsistence is slash-and-burn farming. The Fore language has three distinct dialects and is the southernmost member of the East Central Family, East New Guinea Highlands Stock, Trans–New Guinea phylum of Papuan languages. In the 1950s the neurological disease kuru was discovered in the South Fore.
Transmissible spongiform encephalopathies (TSEs) also known as prion diseases, are a group of progressive, incurable, and fatal conditions that are associated with prions and affect the brain and nervous system of many animals, including humans, cattle, and sheep. According to the most widespread hypothesis, they are transmitted by prions, though some other data suggest an involvement of a Spiroplasma infection. Mental and physical abilities deteriorate and many tiny holes appear in the cortex causing it to appear like a sponge when brain tissue obtained at autopsy is examined under a microscope.
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