pathogen
an organism that causes disease
A pathogen is an organism, such as a virus, bacterium, fungus, protozoan, or parasite, that causes disease in its host. Pathogens can infect humans, animals, and even plants. They are able to penetrate a host’s cells and tissues, multiply, and produce toxins that cause harm to the host.
Pathogens can spread in a variety of ways, including through direct contact with an infected person or animal, consuming contaminated food or water, or through the air via respiratory droplets or aerosols. Some common examples of pathogens include the influenza virus, E. coli bacteria, Candida fungus, malaria parasite, and the coronavirus.
Understanding how pathogens spread and identifying them is important in preventing the spread of infectious diseases. Proper hygiene practices, such as hand washing and cleaning surfaces, can help reduce the transmission of pathogens, as can vaccinations and certain medications.
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