Give an example of a definitive host?
definitive host - a host in which a parasite reaches sexual maturity.
malaria is a good example. the malaria parasite mates and reproduces in the mosquito. However, it's gametocytes are formed in humans, making humans the definitive host (not mosquitoes).
An intermediate host is an animal that is needed for a parasite to develop through one or more stages of life before being transferred to a definitive host in which the parasite will develop into sexual maturity. A reservoir host is a host that may be an intermediate or definitive host but provides a place where a parasite may "hang out" while enviromental conditions are less than optimal.
Infective stage is the life cycle stage where parasite able to initiate an infection in a definitive or intermediate host. Diagnostic stage is the life cycle stage leaving the definitive host, it is the stage that links the parasitic way of life with either the free-living phase of the life cycle or the phase of development that occurs in an intermediate host.
Definitive host (DH). A definitive host is an organism that hosts the adult (sexual) form of the parasite Intermediate host (IH). An intermediate host is an organism that hosts the asexual form of the parasite (only when there is an obligatory passage through the host). Intermediate hosts can be divided into two groups: Passive IH (molluscs in the case of Schistosoma) Active IH (tsetse fly in the case of trypanosomes) Source: http://www.icp.ucl.ac.be/~opperd/parasites/types3.htm
Parasites can be acquired through direct or indirect contacts with infected host it can be from definitive host humans, or an intermediate host animals through ingestion of contaminated food and water, skin penetration (walking with bare foot), inhalation of air-borne eggs, bite of arthropods, congenital and sexual transmission.
No, for two reasons. First, tapeworms are species- specific for the definitive host (when the tapeworm starts to look like a tapeworm) - the canine tapeworms cannot infest human intestines. Second, tapeworms have a complex lifecycle - they must pass through both definitive and intermediate hosts. For the most common canine tapeworm (Dipylidium), the intermediate host is a flea that must be ingested by the dog. So long as a human is not eating fleas…
Flukes are a type of flatworm, called a trematode. The eggs pass from the host (i.e. human) with the feces. When the eggs reach water, they hatch into free-swimming forms called miracidia. The miracidia penetrate a snail or other molluscan host to become sporocysts. The cells inside the sporocysts typically divide by mitosis to form rediae. Rediae, in turn, give rise to free-swimming cercariae, which escape from the mollusk into the water. Using enzymes to…
A pathogen (being something living from the goodness a body example: a tic living from a dog) 3 ways it can effect the host is: * disease of the host as the pathogen carried disease. * malnutrition of the host as the host can become weak due to the pathogen surviving from the hosts body. Example would be iron deficiency in the host, due to the pathogen using the hosts blood to live on *…