Parasites

Parasitism

Nature

Human parasites are the cause of many diseases. There are ectoparasites, like mites and lice, which live on the outside of the body, and internal parasites, which live in the intestinal tract and internal organs. External parasites are generally found on or in the skin and are important pests because they bite or annoy both humans and their pets. Fleas, mange mites, and ticks are the most frequently encountered and most troublesome pests that attack humans and their pets.

Background

Parasites are organisms living in or on another of a different kind, deriving their subsistence form the living material, digested food, secretions or other products of their host, are inextricably bound up with their host or hosts in the continuance of their life, and is rather injurious than beneficial in their influences. Parasitism is a relation of dependence, always nutritive, often more, between the parasite and the host but the inter-relation takes so many forms that absolutely precise definition is impossible, and it is not easy to separate off parasitism from other vital associations. A living creature habitually growing on a plant is called an epiphyte; it is not a parasite unless it gets its food in whole or in part from its bearer, as mistletoe does. A living creature growing on an animal is called a epizoic, like a barnacle on a whale; it is not a parasite unless it gets its food in whole or in part from its bearer, such as many fish lice. Parasitism is not symbiosis, a mutually beneficial internal partnership between two organisms of different kinds, such as unicellular algae which live within Radiolarians, some polyps, and a few worms. Nor is it commensalism, a mutually beneficial external partnership between two organism of different kinds, such as some kinds of hermit crabs which are always accompanied by sea-anemones. The distinction between parasitism and these other forms of relations is difficult to make. A distinction between parasites and predators must be made because killing off the host is not in the interest of the parasite.

Parasitism is also a term used metaphorically to describe the poor and the rich, depending on who is using it, and other human relationships.

Incidence

Parasitic infections remain a significant global health concern, affecting over one billion people annually, particularly in tropical and subtropical regions. Diseases caused by parasites, such as malaria, schistosomiasis, and leishmaniasis, contribute to high morbidity and mortality rates, especially among vulnerable populations with limited access to healthcare and sanitation. The economic burden is substantial, impacting agricultural productivity and educational attainment in affected communities.
In 2022, an outbreak of malaria—caused by the Plasmodium parasite—was reported in the Oromia region of Ethiopia, resulting in over 1.5 million cases and straining local healthcare resources (World Health Organization, 2023).

Claim

Parasites are a critically important problem that demands urgent attention. These organisms cause immense suffering, spreading deadly diseases and crippling economies worldwide. Ignoring parasites means allowing millions to endure preventable illness and poverty. Their impact on human health, agriculture, and even wildlife is devastating and far-reaching. We cannot afford complacency—combating parasites must be a global priority if we hope to protect lives, ensure food security, and promote sustainable development for all.

Counter-claim

Frankly, the concern over parasites is vastly overblown. In today’s world, with modern hygiene, medicine, and food safety, parasites pose little to no real threat to most people. Worrying about them is a waste of time and energy better spent on more pressing issues. The fear surrounding parasites is outdated and exaggerated—let’s focus on problems that actually impact our daily lives, not on these minor, easily managed nuisances.