Bacteria, viruses, protists, parasites, and fungi can all cause disease and can be referred to as pathogens.
A pathogen is any external biological agent that is housed in a certain biological entity, damaging its anatomy in some way, from visible or not visible diseases or damage.
This biological entity that houses a pathogenic agent is called a host inasmuch as it is the one who receives the pathogenic entity and houses it in its body.
- In general, this relationship external entity-biological entity (which can be animal, vegetable or human) can be of three types: through symbiosis of parasitism, mutualism or commensalism.
- Examples of this are fungi, bacteria and viruses that cause diseases.
- In some cases, the biological agent ends up adapting to the presence of the parasite or pathogen, because it also adapts to the host (that is why they are symbiotic relationships).
- In this relationship, one of the parties depends on the other: the parasite depends on the host, and obtains benefits from it, for which the host is seen in some way and to some extent, damaged.
Therefore, we can conclude that bacteria, viruses, protists, parasites, and fungi can all cause disease and can be referred to as pathogens.
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