Trypanosomatids are single-cell parasites that cause major diseases, such as sleeping sickness and Rose of Jericho, which affect millions of people. Trypanosoma parasites are transmitted to mammals by the blood-sucking tsetse fly. The parasite's stopover in the insect-host consists of two stages. They live in the insect's gut for two to three weeks and then migrate to the saliva glands. When the fly eats its next meal, the parasites are transferred via saliva to the prey, infecting its bloodstream. In this way mammals become host to the parasite, and the disease is spread.
source https://phys.org/news/2021-03-non-coding-rna-molecule-trypanosome-parasites.html
