As of 2000, the disability-adjusted life-years (9 to 10 years) lost due to sleeping sickness are 2.0 million. From 2010 to 2014, there was an estimated 55 million people at risk for gambiense African Trypanosomiasis and over 6 million people at risk for rhodesiense African trypanosomiasis. In 2014, the World Health Organization reported 3,797 cases of Human African Trypanosomiasis when the predicted number of cases were to be 5,000. The number of total reported cases in 2014 is an 86% reduction to the total number of cases reported in 2000.The disease has been recorded as occurring in 37 countries, all in sub-Saharan Africa. It occurs regularly in southeast Uganda and western Kenya, and killed more than 48,000 Africans in 2008. The Democratic Republic of the Congo is the most affected country in the world, accounting for 75% of the Trypanosoma brucei gambiense cases. The population at risk being about 69 million with one third of this number being at a very high to moderate risk and the remaining two thirds at a low to very low risk. The number of people being affected by the disease has declined. At this rate, sleeping sickness elimination is a possibility. The World Health Organization plans to eradicate sleeping sickness by 2030. History
The condition has been present in Africa for thousands of years. Because of a lack of travel between indigenous people, sleeping sickness in humans had been limited to isolated pockets.
Winterbottoms sign is common in T. b. gambiense infection.Other features
Those affected may additionally present with: skin rash, haemolytic anaemia, hepatomegaly and abnormal liver function, splenomegaly, endocrine disturbance, cardiac involvement (e.g. pericarditis, and congestive heart failure), and ophthalmic involvement. Neurological phase
The second phase of the disease, the neurological phase (also called the meningoencephalic stage), begins when the parasite invades the central nervous system by passing through the blood–brain barrier. Progression to the neurological phase occurs after an estimated 21–60 days in case of T. b. rhodesiense infection, and 300–500 days in case of T. b. gambiense infection.In actuality, the two phases overlap and are difficult to distinguish based on clinical features alone; determining the actual stage of the disease is achieved by examining the cerebrospinal fluid for the presence of the parasite.Sleep disorders
Sleep-wake disturbances are a leading feature of neurological stage and gave the disease its common name African sleeping sickness. Infected individuals experience a disorganized and fragmented sleep-wake cycle. Those affected experience sleep inversion resulting in daytime sleep and somnolence, and nighttime periods of wakefulness and insomnia. Additionally, those affected also experience episodes of sudden sleepiness.Neurological/neurocognitive symptoms
Neurological symptoms include: tremor, general muscle weakness, hemiparesis, paralysis of a limb, abnormal muscle tone, gait disturbance, ataxia, speech disturbances, paraesthesia, hyperaesthesia, anaesthesia, visual disturbance, abnormal reflexes, seizures, and coma.