Kuru

Kuru is a fatal neurodegenerative disease that emerged among the Fore people of Papua New Guinea in the mid-20th century. The condition causes progressive dementia, loss of motor control, ataxia, and psychiatric symptoms, typically resulting in death within 6 to 24 months of symptom onset. The epidemic peaked in the late 1950s and early 1960s, affecting predominantly women and children. Cases declined sharply after the 1960s as the cultural practices associated with transmission were abandoned.

Transmission and Discovery

Kuru was transmitted through the consumption of infected brain tissue during endocannibalistic funeral rites. This practice, known as mortuary cannibalism, allowed the infectious agent to pass from deceased relatives to mourners. The disease was first documented by Australian physician G. V. Lawrence in 1957, who initially suspected a viral or genetic cause. Subsequent research by Daniel Carleton Gajdusek identified the unique mode of transmission, leading to the hypothesis that the disease was caused by an unconventional infectious agent.

Prion Hypothesis and Resolution

The medical mystery of Kuru was pivotal in the development of the protein world hypothesis regarding prions. Gajdusek and his colleagues demonstrated that the disease could be transmitted to chimpanzees, confirming its infectious nature despite the lack of a conventional pathogen. This work led to the discovery of prions—misfolded proteins that induce normal proteins to misfold—earning Gajdusek the Nobel Prize in Physiology or Medicine in 1976. The decline of kuru is attributed to the cessation of funerary cannibalism by the Fore people in the late 1950s, supported by colonial administration policies and changing cultural norms.