A pathogen is a type of microorganism, such as a bacterium, virus, fungus, or parasite, that can cause diseases. These harmful organisms have the ability to invade and multiply within the body, leading to infection and illness. Pathogens can be spread through various ways, including direct contact with infected individuals, contaminated food or water, or insect bites. Understanding and controlling pathogens are critical in preventing the spread of infectious diseases, often through measures such as vaccination and hygiene practices.

What is a "pathogen"?

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