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Amoeba, one of the best known parasites

What are

Parasites are living things that derive from other organisms the resources necessary for their survival.

Parasite information (main characteristics)

They are considered aggressors because they harm the host organism through parasitism.

The parasite can live for many years in its host without causing great harm to it, ie without impairing its vital functions.

However, some of them may even cause the organism to die, in which case, however, the parasite will succumb along with its host, since it was through him that he benefited unilaterally.

Among the different species of parasites, there are facultative parasites, which are so-called because they do not need only one host to survive.

This species is able to survive both inside (in parasitic form) and outside (free life) of another living organism. This is the case of fly larvae that can develop either in necrotic wounds (such as parasites) or decomposed organic matter (such as free-living larvae).

The parasite is able to reproduce by spreading its eggs, and these eggs usually infect other hosts from which they will derive their means of survival through parasitism.

Parasite Transmission

They can be transmitted between humans through personal contact or the use of personal objects.

They can also be transmitted through water, food, hands without proper cleaning, dust, through soil contaminated by larvae, intermediate hosts (mollusks) and many other means.

The beings that parasitize man are divided into five phyla:

· Protozoa: composed of unicellular and microscopic beings (eg giardia, trichomonas, etc.).

· Platyhelminthes: flat-shaped worms (eg taenia solium and saginata).

· Nematoda: round-shaped worms (eg ascaris lumbricoides, causing ascariasis).

· Acantocephala: Round-shaped worms with pseudo-segmentation.

Arthropoda: formed by insects, mites in general (eg arachnids, insects).


- Parasitology is the science focused on the study of parasites. Scientists working in this area study the life cycle of parasites, transmitted diseases, ways of combating human parasites, genetics and morphology of these beings.