Diseases that can spread from an infected person to a healthy person through the air, water, food or physical contact, are called communicable diseases.
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Microbial diseases that can spread from an infected person to a healthy person through the air, water, food or physical contact are called communicable diseases or infectious diseases.
Some of the examples of communicable diseases are Hepatitis-B. According to current statistics, Hepatitis-B is the most common infectious disease in the world, Malaria, Hepatitis-C, Dengue, Tuberculosis etc