Flashcards in Introduction to Parasites Deck (58)
Loading flashcards...
1
Parasites
Organsims that live in or on another organism (its host) and benefits by deriving nutrients at the others expense, does not necessarily cause disease
2
Mutuallsm
An association in which both species benefit from the interaction
3
Parastism
An association in which the parasite derives benefit and the host gents nothing in return but always suffers some injury
4
Commensalism
An association in which the parasite only benefits without causing harm to the host
5
3 classes of host
Definitive host
Intermediat host
Paratenic host
6
Definitive host
Harbous the adult stage of hte parasite or where the parasite undergoes sexual reproduction
7
Intermediate host
harbours the larval or asexual stages of the parasite. Some parasites have 2 intermediate hosts in their lifecycle
8
Paratenic host
Host where the parasite remains viable without further development
9
2 types of parasites
Protozoa
Helminths
10
Microparasites
Protozoa
11
Macroparasites
Helminths
12
6 examples of microparasites
Cryptosporidium
P.Falciparum-malaria
T.cruzi trypomastigole
Trypanosoma cruzi
Entamoeba
Giardia Lamblia
13
5 groups of helminth
Cestodes
Trematodes
Intestinal nematode
Tissue nematode
14
Example of a cestode
Taenia sp
15
Example of a trematode
Schistosomiasis
16
Example of an intestinal nematode
Ascaris lumbricoides
17
Example of a tissue nematode
Wucheria bancrofti
18
Direct life cycle
Only 1 definitive host
19
Simple indirect life cycle
2 hosts- intermediate and direct
20
Complex indirect life cycle
More than 1 intermediate host
21
Name the type of life cycle:
bird>poo>sourbug>bird
Simple indirect cycle
22
Name the type of life cycle:
bird>poo>amphipod>amphibian>fish>bird
Complex indirect
23
Name the type of life cycle:
Bird>poo>bird
Direct
24
Describe the parasite ascariasis
Macroparasite. Intestinal nematode. Ascaris lumbricoidis.
25
Who is most commonly affected by ascariasis?
3-8yrs. Areas of poor hygeine
26
Describe the life cycle of ascariasis
Direct life cycle:
eggs in human intestine, shed into environment in faeces. Eating contaminated food/water. eggs pass into intestine. Migrate to portal circulation to alveoli to lungs
27
2 clinical phases of ascariasis
Lung migration
Intestinal Phase
28
Describe the lung migration phase of Ascariasis
Loeffler's syndrome- dry cough, dyspnoea, wheeze, haemoptysis, eosinophilic pneumonitis
29
Describe the intestinal phase of ascariasis
Malnutrition, migration into hepatobiliary tree and pancreas, intestinal obstruction, worm burden
30