Name two diseases caused by Protozoans What are their causal organisms?

The two diseases caused by Protozoans are:

1) Sleeping sickness caused by Trypanosoma:

The medical name for sleeping sickness is African Trypanosomiasis. And, it is caused by the protozoa which belongs to the species, Trypanosoma brucei.

2) Kala-azar caused by Leishmania:

The medical name for Kala Azar is Visceral leishmaniasis. It is caused by the protozoa of the Leishmania genus.