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Flashcards in introduction to parasites Deck (15):
1

what is a parasite defined as?

an organism that lives in a host organism and gets its food at the expense of the host

2

what parasitic disease causes the most deaths globally?

malaria

3

what 3 classes of parasites are there?

protozoa
helminths (worms)
arthropods

4

what are some example of protozoa?

malaria
amoebae
flagellates

5

what are some examples of helminths?

roundworms
tapeworms
flukes

6

what are some examples of arthropods?

lice
ticks
mites

7

what are protozoa?

microscopic, one celled organisms that are able to multiply in humans

8

how are protozoa transmitted?

fecal - oral route if they live in the human intestine
arthropod vector if they live in the blood or tissue of humans

9

what parasite causes malaria?

plasmodium species

10

what is the life cycle of malaria?

sporozoites injected under skin by mosquito
travel through blood and enter liver
mature in liver and re-enter circulation as
merozoites
invade red cells, multiply and lyse cells- reinvade more red cells

11

what parasite causes amoebic dysentry?

entamoeba histolytica

12

what are some clinical features of amoebic dysentry?

cysts in stool and liver abscess in late disease

13

what parasite causes leishmaniasis?

leishmania species carried by the sandfly

14

how is leishmaniasis diagnosed?

histology of the biopsy

15

what are the 3 major species of schistosomes?

s. haematobium
s. mansoni
s. japonicum