Gut Protozoa

Question 1

How are intestinal Protozoa transmitted between hosts?

Answer 1

Faecal-orally spread through contamination of hands, food or water.

Question 2

What is the only medically important amoebae in humans?

Answer 2

Entamoeba histolytica

Question 3

Name 4 species of amoebae.

Answer 3

Entamoeba histolytica
Entamoeba dispar
Entamoeba coli
Endolimax nana

Question 4

What two life cycle stages occur in all amoebae?

Answer 4

Trophozoite stage

Cyst stage

Question 5

Amoebae move using ___________ ?

Answer 5

Pseudopodia

Question 6

How many species of intestinal Protozoa are infective to humans?

Answer 6

26 species

Question 7

Trophozoite said divide by?

Answer 7

Binary fission

Question 8

What proportion of amoebiasis patients have clinical presentations?

Answer 8

~10%

Question 9

What is the characteristic symptom of amoebiasis?

Answer 9

Dysentery with blood and mucus present in the stool

Question 10

How many cases of amoebiasis emerge per year?

Answer 10

Approximately 50 million.

Question 11

Number of nuclei in mature E. histolytica/dispar cysts?

Answer 11

Four.

Question 12

Where do E. histolytica trophozoites live?

Answer 12

In the colon, ingested red cells.

Can also be found in FRESH diarrhoeal stool.

Question 13

How many cysts to Entamoeba coli have?

Answer 13

Eight.

Question 14

Excystment of amoebic cysts release?

Answer 14

Trophozoites

Question 15

What are the morphological differences of Entamoeba histolytica and Entamoeba dispar?

Answer 15

They are morphologically identical.

Question 16

Geographical distribution of amoebiasis.

Answer 16

Worldwide but occurs more frequently in tropical countries or other areas of poor sanitary conditions.

Question 17

Percentage of the worlds population infected with Entamoeba histolytica/dispar?

Answer 17

Approximately 10%.

Question 18

Deaths caused by amoebiasis per year?

Answer 18

100,000 deaths.