An introduction to parasites

Question 1

3 groups of Parasites

Answer 1

Protozoa, arthropods and helminths

Question 2

Protozoa

Answer 2

Amoeba, malaria and flagellates
Microscopic
Faecal - oral or by a vector

Question 3

Helminths

Answer 3

Roundworm, tapeworm, fluke

Question 4

Arthropod

Answer 4

Lice, tick, mite

Question 5

Malaria

Answer 5

Plasmodium falciparum species in anopheles mosquito
Sporozites injected then mature in liver
Merozites in blood and lyse RBC
Sexual forms taken up by mosquito

Question 6

Amoebic dysentery

Answer 6

Entamoeba histolytica
Trophozite injest RBC and cause bloody diarrhoea with pus
Protozoal cyst in stool and liver abscess

Question 7

Leishamiasis

Answer 7

Cutaneous or muco cutaneous
Kala azar - hepato - splenomegalgy
Spread by sand flies

Question 8

Nematode

Answer 8

Ascaris lumbricoides - ingested eggs hatch in intestine
Travel to lung and are swallowed again
Can see cysts and ova in stool

Question 9

Cestode

Answer 9

Larval cyst in ingested meat

Question 10

Schistomiasis

Answer 10

Miracardia live in snail
Cercaria emerge and travel to lung of human
Schistosome cause fever

Question 11

Helminth infection accompanied by

Answer 11

Eosinophilia

Elevated IgE

Question 12

Definitive diagnosis by

Answer 12

Parasite in tissue or stool and use microscopy

Question 13

Culture for malaria

Answer 13

Thick and thin blood films

Question 14

Serology

Answer 14

Detect antibodies of parasite in deep tissue