Dictionary > Infective stage

Infective stage

Definition
noun
(parasitology) The stage in the life cycle of an endoparasite wherein it can initiate infection to its host
Supplement
A life cycle of a parasite pertains to its cyclic life history. It generally starts from the phase of a fertilized (embryonated) egg. The larva is then released from the egg to develop and reach adulthood, i.e. the reproductive phase in the life of a parasite. The life cycle of a parasite may be direct or indirect. A direct life cycle is one that which it completes its life cycle in a single host. An indirect life cycle is when a parasite requires another host for its development. The stage in the life cycle at which the parasite is able to initiate an infection to its host is referred to as an infective stage. It is in contrast to the diagnostic stage, i.e. the stage at which the parasite leaves the host, e.g. through excretion together with the stool, urine, or sputum. The infective stage of a parasite is one in which the parasite is capable of entering its host and continue its development within the host. Infection in connection with parasitology is defined as an invasion of the body by an endoparasite thereby inciting reaction from the host’s immune system. An endoparasite is a type of parasite that is found inside the body of the host. In contrast, the ectoparasite is one that thrives outside the body of its host. For example, Ascaris lumbricoides, a nematode, is an endoparasite that lives in the gut of its host. Its infective stage is the embryonated egg (as well as the second larval stage). Ingestion of the embryonated egg is one of the modes of transmission of this nematode.
See also:


You will also like...

Adaptation Tutorial
Adaptation Tutorial

Adaptation, in biology and ecology, refers to the process or trait through which organisms or the populations in a habit..

Freshwater lake ecosystem
Freshwater Producers and Consumers

Freshwater ecosystem is comprised of four major constituents, namely elements and compounds, plants, consumers, and deco..

Plant Water Regulation
Plant Water Regulation

Plants need to regulate water in order to stay upright and structurally stable. Find out the different evolutionary adap..

Freshwater aquatic plankton
Freshwater Communities & Plankton

Planktons are microscopic organisms that live suspended in aquatic habitats. There are two groups: the phytoplanktons an..

Human perception in action
Human Perception – Neurology

This tutorial investigates perception as two people can interpret the same thing differently. Know more about human perc..

Structural depiction of catalase, an enzyme
Protein Activity and Cellular Metabolism

Proteins have a crucial role in various biological activities. Get to know how proteins are able to perform as enzymes, ..

Related Articles...

No related articles found

See all Related Topics