Answer :

Disease (Old French disease = lack of ease) is a disorder in a human, Animal or plant, caused by infection, diet or by faulty functions of a process.

Types of disease.

(i) On the basis of duration. Acute or chronic diseases.

(ii) On the basis of period of occurrence. Congenital and acquired diseases.

(iii) On the basis of causal agents. Infectious and noninfectious. Infectious or communicable diseases can be contagious or non-contagious. Non-infectious disease may be deficiency disease, metabolic disease degenerative disease, allergy, cancer and injury.

Examples of infectious disease. are Influenza, tuberculosis, pneumonia.

Examples of non-infectious disease are Cancer, diabetes and blood pressure.

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