By Natsuko Matsukawa National Flags of DRC and Belgium. (Image Source: Alamy; https://tinyurl.com/mr36jtyz) 1.   Introduction Human African Trypanosomiasis (HAT), also known as African sleeping sickness, is a vector-borne parasitic disease primarily transmitted by the tsetse fly. It is caused by two subspecies of Trypanosoma brucei, which is a protozoan, a single-celled parasitic flagellate: T.…