Explain the means of spread of diseases in detail.
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Infectious diseases are caused by organisms (germs) such as bacteria, viruses, fungi or parasites. Germs are a part of everyday life and are found in the air, soil, water and in and on our bodies.
Some germs are helpful and even help us to stay healthy, while others are harmful and cause infection. By understanding about how people can catch an infectious disease, you can then take effective action to prevent their spread.
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