Infectious and Non infectious Diseases
Causes of disease as belonging to two distinct types. One group of causes is the infectious agents, mostly microbes or micro-organisms. Diseases where microbes are the immediate causes are called infectious diseases. There are also diseases that are not caused by infectious agents. Their causes vary, but they are not external causes like microbes that can spread in the community. Instead, these are mostly internal, non-infectious causes. Some diseases are acute, producing severe symptoms that terminate after a short time, e.g., pneumonia; others are chronic disorders, e.g., arthritis, that last a long time; and still others return periodically and are termed recurrent, e.g., malaria. Diseases can be categorized in two types : Infectious and Non infectious Diseases.
Communicable Diseases (Infectious Diseases):
These diseases spread from one organism to another. They may be water borne or air borne diseases. They are caused by attack of microbes such as bacteria, fungi or protozoans and viruses. They are diseases which spread from an infected person to a healthy person through air, water, food, vectors, physical contact or sexual contact. Eg :- common cold, chicken pox, mumps, measles, typhoid, cholera, tuberculosis, malaria, AIDS etc.
Non communicable Diseases (Non-Infectious Diseases):
The diseases which do not spread from infected person to healthy person are known as non-communicable diseases. e.g., diabetes, arthritis, heart disease, cancer etc. Non-infectious diseases can be caused by various factors and are often the result of an interplay of genetics and lifestyle. Many of these diseases are closely related to lifestyle factors such as smoking and obesity and much can be done to decrease your risk through positive lifestyle habits. Non-infectious disease is now responsible for the leading causes of death in both developed and some developing countries.
Causes of non-infectious disease are categorized into genetically inherited diseases and environmental diseases. Non-infectious diseases that are not genetic disorders are environmental diseases, although many diseases are affected by both genetic and environmental factors.
Useful for CBSE, ICSE, NCERT & International Students
Grade : 9
Subject : Biology
Lesson : Why Do We Fall Ill?
Topic: Infectious and Non infectious Diseases
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