Infectious diseases are caused by organisms or viruses that enter and multiply within the human body
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, leading to illness and potential harm to the individual. These diseases can be spread through various means such as direct contact with an infected person or object, through the air, or through contaminated food or water. Common examples of infectious diseases include influenza, tuberculosis, and HIV/AIDS. Proper hygiene practices, vaccinations, and education on disease prevention are crucial in controlling the spread of infectious diseases and protecting public health.