(i) Leishmania
(ii) Trypanosoma

(i) Communicable diseases - Malaria, Flu, Jaundice, etc
(ii) Non-Communicable disease - Diabates, cancer, heart disease, etcv

Garbage thrown in open places, overflowing drain water or sewer, accumulation of stagnant water in ditches etc.cause spread of disease.These are the places where disease causing microbes multiply, mosquitoes and flies breed.Thus, diseases may spread in the community and hence affect individual health.

Group of diseases:
(i) Infection diseases: These diseases are caused by some parasitic organism, such as bacteria, viruses and can be transmitted to other examples of such diseases are malaria, jaundice, etc.
(ii) Non-infection diseases: They may be genetic or due to malfunctioning of internal body organ without infection.They do not spread in the community.For example, high blood pressure.

(i) Immediate cause of disease is Infectious organisms like virus, bacteria, fungi, protozoan etc.For example, the cause of loose motions can be an infection with a virus, Here viruses is the immediate cause of disease.
(ii) Contributory cause of disease:
(a) poor health due to lack of good nourishment.
(b) poor economic condition due to which one does not get proper and sufficient food and lives in unhygienic conditions.
(c) genetic defects which cause some people more prone to disease than others.
(d) Lack of public services.