Each parasite has two names, one general and one particular, with the former beginning with a capital letter and the latter beginning with a tiny letter, followed by the designator's name, punctuation, and lastly the year. The generic and particular names are italicized, but not the name of the designer. For example, the general name of a tapeworm is Tegumental organ with hooks, and the particular name is Hymenolepsis nana.
The term "parasite" is often used interchangeably with "endoparasite" and "exoparasite". Endoparasites include viruses and bacteria, while exoparasites include worms and other organisms that live in the body but do not eat food, such as lice or fleas. Parasites can also be defined as any organism that obtains nutrients from another organism without providing any useful service in return. Humans are not alone in being parasitized by other organisms; parasites may be pathogens (disease-causing organisms) or symbionts (organism that live within another organism and provide benefits). Examples of pathogenic parasites that infect humans include malaria parasites, which cause malaria; roundworm parasites, which cause ascariasis (roundworm infection) and trichuriasis (hairworm infection); and hookworm parasites, which cause anemia due to their ability to extract blood proteins through their intestinal walls.
A parasite that is successful helps its host. B does minimal harm to its host. C murders its host. D has a longer lifespan than its host. E increases the size of its host's heart.
F parasites are abundant in nature. G knows how to avoid being killed by their host. H is infectious like a virus. I uses insects as transport hosts.
J parasites are found in all phyla of life. K are responsible for a large proportion of all deaths in humans. L cause more death than cancer. M are involved in major evolutionary transitions.
N are important in regulating the immune system. O are used by I as a defence mechanism against other parasites! P are effective tools for preventing disease and promoting health.
Q are useful in treating diseases, such as malaria and leishmaniasis.
R are able to invade new cells.
S can live inside other organisms, including humans.
T are involved in complex behaviors such as mating and social interaction.
U have been implicated in the evolution of intelligence.
V are involved in ecological processes such as energy flow through ecosystems and speciation.
Parasites are classified into three categories.
A parasite is a creature that lives on or in the host and obtains its sustenance from or at the cost of the host. Protozoa, helminths, and ectoparasites are the three primary types of parasites that may cause disease in humans. Entamoeba histolytica is a kind of protozoa. It can invade the human body and cause amoebiasis. This disease is usually found in countries where clean water is not available for drinking purposes.
Parasitic diseases are caused by organisms that live within their hosts and benefit from them somehow. Most parasitic infections are treated with antibiotics. However some parasites are able to resist antibiotic treatment. Infections caused by these parasites are called antibiotic-resistant infections.
There are many different kinds of parasites that can infect people. Some examples are Giardia lamblia, Toxoplasma gondii, and Trypanosoma cruzi. Someone who has been exposed to any one of these parasites but survives the infection is said to have acquired passive immunity. The immune system of someone with passive immunity will be prepared if another person with similar antibodies gets infected with one of these parasites later on. That person's immune system will be able to fight the infection because it has been "prepared" by being exposed to these antibodies before.
Someone who does not have protective antibodies but encounters one of these parasites for the first time will become susceptible to the infection.