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Flashcards in Introduction to Parasites Deck (58)
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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

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Example of a tissue nematode

Wucheria bancrofti

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Direct life cycle

Only 1 definitive host

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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

Treatment for ascariasis

Albendazole-prevents glucose absorption by worm-detaches and passes out in faeces

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