introduction to parasites Flashcards
1
Q
main groups of parasites
A
protozoa
helminths
arthropods
2
Q
protozoa
A
microscopic one-celled organisms, can be parasitic or free living
3
Q
parasite
A
a organism that lives in another organism and gets its food at the expense of its host.
4
Q
diagnostic principles of parasitology
A
- blood films (malaria)
- histology of biopsy material (schistosomiasis)
- ova, parasites and cysts in faeces eg. tapeworm
- adhesive tape on perianal region (threadworm)
- serology
5
Q
blood-borne parasite examples
A
- plasmodium spp.
- leishmaniasis
- echinococcus
6
Q
enteric parasitic infections
A
- amoebic dysentery
- enterobiasis vermiculas (threadworm)
- ascaris lumbricoides
- cestodes (tapeworms)
- schistosomiasis
7
Q
parasite that causes malaria
A
plasmodium spp. eg. plasmodium falciparum
8
Q
plasmodium life cycle
A
- sporozoites injected under the skin by mosquito
- travel through blood to liver, here they mature to merozoites
- the parasite then enters red blood cells and multiply causing them to lyse
- sexual forms taken up by mosquito
9
Q
amoeba dysentery symptoms
A
diarrhoea with blood and pus. cysts in stool. interstinal and extra intestinal infections. liver abscess in late disease.
10
Q
leishmaniasis symptoms
A
visceral form: fever, weight loss and hepato-splenomegaly cutaneous form: skin ulceration muco-cutaneous form: mucosal ulceration
11
Q
echinococcus symptoms
A
cyst forms in liver
