Study Notes on African Trypanosomiasis

African Trypanosomiasis, commonly known as sleeping sickness, is caused by two subspecies of the parasite Trypanosoma:
- Trypanosoma brucei gambiense
- Trypanosoma brucei rhodesiense
The disease is transmitted by the Tsetse fly.

The Tsetse fly takes a blood meal from a mammalian host, during which it injects metacyclic trypomastigotes into the host's bloodstream.

Upon injection, the metacyclic trypomastigotes enter the bloodstream of the mammalian host.
Inside the host, the parasites transform into trypomastigotes.
The trypomastigotes multiply through a process known as binary fission.

During the acute phase of the infection, circulating trypomastigotes can be detected in the blood.
These parasites can also be found in body fluids, mainly lymph and other circulatory fluids.
In the latent phase, the trypomastigotes are usually undetectable in the bloodstream, indicating a progression of the disease.

Tsetse Fly: The primary vector responsible for transmitting the disease.
Metacyclic Trypomastigotes: The infectious form of the parasite that is injected by the Tsetse fly.
Trypomastigote: The form of the parasite that develops in the mammalian host and is responsible for the disease symptoms.
Binary Fission: The asexual reproduction method used by trypomastigotes to replicate in the host's body.
Acute Phase: Initial stage characterized by high levels of trypomastigotes in the blood.
Latent Phase: Later stage where the presence of trypomastigotes in the bloodstream becomes undetectable.