The Sleeping Sickness Commission was a medical project established by the British Royal Society to investigate the outbreak of African sleeping sickness or African trypanosomiasis in Africa at the turn of the 20th century. The outbreak of the disease started in 1900 in Uganda, which was at the time a protectorate of the British Empire. The initial team in 1902 consisted of Aldo Castellani and George Carmichael Low, both from the London School of Hygiene and Tropical Medicine, and Cuthbert Christy, a medical officer on duty in Bombay, India. From 1903, David Bruce of the Royal Army Medical Corps and David Nunes Nabarro of the University College Hospital took over the leadership. The commission established that species of blood protozoan called Trypanosoma brucei, named after Bruce, was the causative parasite of sleeping sickness.
Background Symptoms of sleeping sickness in animals were evident in ancient Egyptian writings. Records of Arabian traders in the Middle Ages mentioned the prevalence of sleeping sickness among Africans and their dogs. Sultan Mari Jata, emperor of Mali, was said to die of the disease. It remained one of the major infectious diseases in southern and eastern Africa in the 19th century. It caused constant threats to cattle and horses in southern Africa such as the Zulu Kingdom. The Zulu people called this animal disease nagana (which means "to be low or depressed in spirit") which became a popular name in Africa; while some Europeans referred to its as the "fly disease."
The first medical description of human sleeping sickness was given by English naval surgeon John Aktins in 1734. Atkins described the neurological symptoms, meaning the late stages of infection, among the natives of Guinea referring to the cause of deaths as "sleepy distemper." In 1803, another English physician Thomas Winterbottom gave more elaborate symptoms including the different pathological disorders due to the infection in Sierra Leone. An important diagnosis recorded by Winterbottom was swollen posterior cervical lymph nodes that were visible since the early stage of infection. Slaves who developed such swellings were unfit for trade. The symptom has been named "Winterbottom's sign." Starting from 1900 and lasting for two decades, there was an outbreak of human sleeping sickness in Uganda. The outbreak originated in the Busoga kingdom in eastern Uganda. The first case of human infection was recorded in 1898. It was particularly severe in 1901, with death toll estimated to about 20,000. More than 250,000 people died in the epidemic. The disease was then known as the "negro lethargy."
Initial discoveries
Disease carrier Scottish missionary and explorer David Livingstone was the first to suggest that sleeping sickness in animals was transmitted by the bite of tsetse fly. His 1852 report mentioned that cattle he used in the valleys of the Limpopo River and Zambezi River and at the banks of the Lake Malawi and Lake Tanganyika had sleeping sickness after exposure to tsetse flies. He made an experimental observation on cattle bitten by tsetse flies, which he described in his 1857 report, saying:[The] animal continues to graze, emaciation commences, accompanied with a peculiar flaccidity of the muscles, and this proceeds unchecked until, perhaps months afterward, purging comes on, and the animal, no longer able to graze, perishes in a state of extreme exhaustion. Those which are in good condition often perish soon after the bite is inflicted with staggering and blindness, as if the brain were affected by it... These symptoms seem to indicate what is probably the cause, a poison in the blood, the germ of which enters when the proboscis is inserted to draw blood. The poison-germ, contained in a bulb at the root of the proboscis, seems capable, although very minute in quantity, of reproducing itself, for the blood after death by tsetse is very small in quantity, and scarcely stains the hands in dissection.Livingstone further made experiments to cure infection in horses using arsenic as he reported in The British Medical Journal in 1858.
Animal sleeping sickness
Scottish physician David Bruce, while working in the Royal Army Medical Corps stationed at Pietermaritzburg, Natal, South Africa, was assigned to investigate nagana which severely struck cattle and horses in Zululand. On 27 October 1894, he and his wife Mary Elizabeth Bruce (née Steele), who was also a microbiologist, moved to Ubombo Hill, where the disease was most prevalent. He discovered protozoan parasites from the blood of infected animals. It was the discovery of Trypanosoma brucei, the name created by Henry George Plimmer and John Rose Bradford in 1899 in honour of the discoverer. The genus Trypanosoma was created by Hungarian physician David Gruby in his description of T. sanguinis, a species he discovered from the blood of frogs in 1843. How the infection was transmitted in animals and its relation to human sleeping sickness were not known.
The first human trypanosome
On 10 May 1901, an English steamboat captain was admitted to a hospital at Bathurst, Gambia, due to high fever. British Colonial Surgeon Robert Michael Forde examined the blood samples and identified some organisms which he attributed as parasitic worms. He reported his observation in 1902. After recovery, the same person was admitted to the same hospital again in December 1901. Forde asked Joseph Everett Dutton, a parasitologist on expedition who was visiting the hospital at that time. Forde described the causative infection as "very many actively moving worm-like bodies whose nature he was unable to ascertain" from his original diagnosis to Dutton. Dutton prepared several blood smears from which he concluded that the parasites were protozoans belonging to the genus Trypanosoma, yet distinct in structure and disease it caused from those of known species at the time. In his report in 1902, he made a concluding suggestion:At present then it is impossible to decide definitely as to the species, but if on further study it should be found to differ from other disease-producing trypanosomes I would suggest that it be called Trypanosoma gambiense.
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