en.wikipedia.org
"The preclinical or asymptomatic phase, also called the incubation period, averages 10–13 years, but can be as short as 5 and has been estimated to last as long as 50 years or more after initial exposure.[13] The clinical stage, which begins at the first onset of symptoms, lasts an average of 12 months. The clinical progression of kuru is divided into three specific stages: the ambulant, sedentary and terminal stages..."
"In the first (ambulant) stage, the infected individual may exhibit unsteady stance and gait, decreased muscle control, tremors, difficulty pronouncing words (dysarthria), and titubation. This stage is named the ambulant because the individual is still able to walk around despite symptoms."
Causes
"Kuru is largely localized to the Fore people and people with whom they intermarried.[16] It was thought to have been transmitted through ritualistic cannibalism"
