The person or animal who has been infected with an adult, or sexual, form of pathogen is called?

Appeared in: RIMS Nursing Officer - 2022

Explanation

The definitive host is defined as the organism in which a parasite reaches its adult stage and reproduces sexually.
The question specifies the host is infected with the 'adult, or sexual, form' of the pathogen, which directly matches the definition of a definitive host.
For example, in malaria, the mosquito is the definitive host because the sexual cycle (sporogony) of the Plasmodium parasite occurs within it.
Conversely, in most tapeworm infections, the human is the definitive host where the adult worm resides in the intestine.

Option B: 'In-definitive Host' is not a recognized or standard term in the field of parasitology.
Option C: The intermediate host harbors the larval or asexual stages of a parasite, not the adult or sexual stage.
Option D: 'Mediate Host' is not a standard term in parasitology. It might be confused with 'intermediate', but it is not a correct term.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Host types in parasitology as background academic context rather than a clinical decision trigger.
Identifying the definitive and intermediate hosts is critical for developing public health strategies to control parasitic diseases. Breaking the life cycle at any point can prevent transmission.
For a nurse, understanding the patient's role as a potential definitive or intermediate host helps in providing appropriate patient education, such as hygiene practices to prevent fecal-oral transmission or protective measures against vector bites.
What if? If a parasite has no intermediate host and completes its entire life cycle in a single host (like Enterobius vermicularis, the pinworm), control measures must focus entirely on treating the infected individual (the definitive host) and preventing autoinfection and person-to-person spread through strict hygiene.

How to Approach the Question

First, identify the key terms in the question: 'adult' and 'sexual form' of a pathogen.
Recall the definitions of different types of hosts in parasitology.
The 'definitive host' is where the parasite's sexual reproduction or adult stage occurs.
The 'intermediate host' is where the parasite's asexual reproduction or larval stage occurs.
Match the key terms from the question ('adult', 'sexual form') with the correct definition.
Eliminate options that are not standard terms ('In-definitive', 'Mediate') or that have a different definition ('Intermediate Host').

Concept Tested & Keywords

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E6 Parks TextBook of Preventive & Social Medicine part 2 — Subpart B (pp 233-449 of 464) p. 84-86

E6 Microbiology Essentials Sastry 4e Part 1 p. 106-108

E6 Medicine Harrison 22e Part 1 p. 1776-1778

Practise the full RIMS Nursing Officer - 2022

Attempt every question from this paper in a timed mock, then review the full solution for each one.