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B2: microbiology > Parasite: part 1 > Flashcards

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1

Define infection

invasion by and growth of pathogenic microorganisms within the body

2

Define disease

a disordered or incorrectly functioning organ, part, structure, or system of the body resulting from the effect of genetic or developmental errors, infection, poisons, nutritional deficiency or imbalance, toxicity, or unfavorable environmental factors; illness; sickness; ailment.

3

Define parasite

organism living in or on the host and dependent on it for nutrition - causing damage

4

Distinguish types of parasite

Endoparasite: protazoa and metazoa. = parasites that live inside the body of the host Ectoparasite = parasites that live on the outer surface of the host and generally attach themselves during feeding

5

What is protozoa

single celled organisms Eukaryotes (genome within a nucleus, complex organelles in cytoplasm)

6

t/f pathogenesis of protozoa is constant

F

7

T/F protozoa infection is associated with eosinophilia

F

8

What can be a route of protozoa infection

Some have insect vectors (eg malaria)

9

Examples of protozoa

amoeba, coccidiae, ciliates, flagellates

10

What are metazoa

Multicellular organisms (Helminths/worms)

11

Differentiate the type of parasites that metazoa and protozoa are

Protozoa are often obligate intracellular parasites Metazoa are free living, not within cells

12

T/F all metazoa invade tissue

F. Some just inhabit gut (geohelminths), other invade tissues

13

T/F metazoa is associated with eosinophilia.

T Eosinophilia – if invade blood

14

2 types of amoeba. Which is dangerous How are you infected by these

Entamoeba histolytica (=INVASIVE) , Entamoeba dispa(=COMMENSAL) Infection occurs by ingestion of mature cysts in food or water, or on hands contaminatd by faeces

15

How common is amoeba infection and how deadly

10% of world infected with E.histolytica 3rd most common cause of parasitic death

16

Most common causes of parasitic death

Schichtomiasis, malaria, E. histolytica