Human African Trypanosomiasis (HAT)


11:55 AM

1 min read
Human African Trypanosomiasis (HAT) Blog Image


In a landmark achievement, Chad has become the first country in 2024 and the 51st globally to eliminate a neglected tropical disease (NTD) — the gambiense form of human African trypanosomiasis (HAT).

About Human African Trypanosomiasis (HAT)

  • It is also known as sleeping sickness.
  • It is caused by protozoan parasites transmitted by infected tsetse flies and endemic in sub-Saharan Africa.
  • It takes 2 forms, depending on the subspecies of the infecting parasite:
    • Trypanosoma brucei gambiense: It is found in 24 countries of west and central Africa, currently accounts for 92% of reported cases and causes a chronic illness.
    • A person can be infected for months or even years without major signs or symptoms. When evident symptoms emerge, often the disease is advanced with the central nervous system already affected.
    • Trypanosoma brucei rhodesiense: It is found in 13 countries of eastern and southern Africa accounts for 8% of reported cases and causes an acute disease.
    • First signs and symptoms emerge a few weeks or months after infection. The disease develops rapidly with multi-organ invasion, including the brain.
  • Tsetse flies inhabit sub-Saharan Africa and only certain species transmit the disease. Rural populations which depend on agriculture, fishing, animal husbandry or hunting are the most exposed.
  • To date, WHO has validated the elimination of the gambiense form of HAT in seven countries: Togo (2020), Benin (2021), Ivory Coast (2021), Uganda (2022), Equatorial Guinea (2022), Ghana (2023) and Chad (2024).

Q1: What are Neglected Tropical Diseases?

Neglected tropical diseases (NTDs) are a diverse group of tropical infections which are common in low-income populations in developing regions of Africa, Asia, and the Americas. They are caused by a variety of pathogens such as viruses, bacteria, protozoa and parasitic worms (helminths).

Source: Chad eliminates sleeping sickness as a public health problem