Disease Definition Class 9 Infectious Diseases Edurev

As we go through life, we face many challenges and one of them is dealing with diseases. Diseases come in different forms and the manner of their transmission is also diverse. Some diseases are caused by infections while others are not. In this post, we will take a look at the difference between infectious and non-infectious diseases. First, it is important to define what a disease is. A disease is any abnormal condition that affects the body’s normal functioning, causing discomfort, dysfunction, or distress. There are many types of diseases that exist in the world today and they can be classified in different ways, one of which is whether they are infectious or non-infectious. Infectious diseases are those that are caused by microorganisms, like bacteria, viruses, fungi or parasites that can be transmitted from one person to another. They can be airborne, waterborne, food-borne, or transmitted through contact with infected bodily fluids, objects or animals. Examples of infectious diseases include the common cold, flu, measles, tuberculosis, malaria, and HIV/AIDS just to mention a few. Non-infectious diseases, on the other hand, are those that are not caused by microorganisms, but rather by genetic or lifestyle factors. They may be caused by several factors such poor nutrition, physical inactivity, smoking, excessive alcohol use, stress, occupational hazards, or exposure to environmental contaminants like air pollution, radiation, and chemicals. Examples of non-infectious diseases include diabetes, cancer, heart disease, stroke, chronic obstructive pulmonary disease (COPD), and Alzheimer’s disease, among others. The difference between infectious and non-infectious diseases lies in their mode of transmission. Infectious diseases are communicable, meaning that they can be passed from one person to another, while non-infectious diseases are non-communicable, meaning that they cannot be transmitted from one person to another. It is important to note that although some diseases are classified as infectious or non-infectious, some may have elements of both. For instance, some infections may be caused by both genetic and lifestyle factors, while some non-infectious diseases may have infectious agents as risk factors. In conclusion, infectious and non-infectious diseases are two main types of diseases that affect humans and animals. While infectious diseases are caused by microorganisms that are easily transmissible from person to person, non-infectious diseases are caused by genetic or lifestyle factors that cannot be transmitted. Understanding the differences between these two types of diseases is important for developing preventive measures and appropriate treatment strategies.

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