Giardia lamblia

Giardia lamblia

Q. 1

The normal habitat of giardia is-

 A

Duodenum and jejunum

 B

Stomach

 C

Caecum

 D

Ileum

Q. 1

The normal habitat of giardia is-

 A

Duodenum and jejunum

 B

Stomach

 C

Caecum

 D

Ileum

Ans. A

Explanation:

Ans. is ‘a’ i.e., Duodenum and jejunum


Q. 2

How many pairs of flagella does Giardia lamblia possess –

 A

One

 B

Two

 C

Three

 D

Four

Q. 2

How many pairs of flagella does Giardia lamblia possess –

 A

One

 B

Two

 C

Three

 D

Four

Ans. D

Explanation:

Ans. is ‘d’ i.e., Four


Q. 3

True about Giardiasis –

 A

Only cyst is infective

 B

Reside in ceacum

 C

Only man to man transmission

 D

Exist in one phases

Q. 3

True about Giardiasis –

 A

Only cyst is infective

 B

Reside in ceacum

 C

Only man to man transmission

 D

Exist in one phases

Ans. A

Explanation:

Ans. is ‘a’ i.e., Only cyst is infective

.   Trophozoites and cysts, both are present in the feces, but it is the resistant cyst that survive outside the body and is responsible for transmission.

.   Infective dose is low ingestion of as few as 10 cysts is sufficient to cause infection in humans.

.  Giardia resides in duodenum and jejunum.

. Giardia is usually transmitted from man to man by fecal-oral route. But infection can also be transmitted from animals to man :

“Giardiasis in dogs is definitely transmissible to humans and serves as a common source for children”.

. Giardia exists in two forms, i.e. trophozoites and cyst.


Q. 4

True about Giardia is –

 A

May cause traveller’s diarrhoea

 B

Giardia inhabits ileum

 C

Trophozoites are infective to man

 D

None of the above

Q. 4

True about Giardia is –

 A

May cause traveller’s diarrhoea

 B

Giardia inhabits ileum

 C

Trophozoites are infective to man

 D

None of the above

Ans. A

Explanation:

Ans. is ‘a’ i.e., May cause traveller’s diarrhoea

.   Giardia can cause traveller’s diarrhea.

.   Other protozoal causes of traveller’s diarrhea

– Entamoeba histolytica                 

–      Cyclospora

–       Cryptosporidium

.  Giardia inhabits the proximal small intestine i..e, duodenum and upper jejunum (not ileum).

.   The infective stage for giardial infection is cyst (not trophozoites).


Q. 5

Which of the following is true with Giardia lamblia‑

 A

Malabsorption commonly seen

 B

Trophozoite forms is binucleate

 C

Diarrhea is seen

 D

b and c

Q. 5

Which of the following is true with Giardia lamblia‑

 A

Malabsorption commonly seen

 B

Trophozoite forms is binucleate

 C

Diarrhea is seen

 D

b and c

Ans. D

Explanation:

Ans. is ‘b’ i.e., Trophozoite forms is binucleate; ‘c’ i.e., Diarrhea is seen

.    Malabsorption is seen only in few cases, most patients are asymptomatic.

.   Most common presentation is diarrhea with abdominal pain, nausea and vomiting.

.    Trophozoite is bilateral, symmetrical and all organs of body are paired.

–       2 Axostyles                    – 4 pairs of flagella

–      2 Nuclei                            – 2 Sucking discs.

.      The gold – standard for diagnosis of giardiasis is microscopic demonstration of the trophozoite, cyst or both in faeces.       

.     Duodenal aspirate or jejunal biopsy (not Jejunal wash fluid) may be required for diagnosis——— Harrison p. 1200. Remember

Metronidazole and tinidazole are drug of choice for Giardia lambia.


Q. 6

The following is true of Giardiasis except ‑

 A

Complement fixation test is diagnostic

 B

Stools contain only cysts

 C

Habitat is colon

 D

All

Q. 6

The following is true of Giardiasis except ‑

 A

Complement fixation test is diagnostic

 B

Stools contain only cysts

 C

Habitat is colon

 D

All

Ans. D

Explanation:

Ans. is ‘a’ i.e., Complement fixation test is diagnostic; ‘b’ i.e., Stools contain only cysts; `c’ i.e., Habitat is colon

.         Amongst the given option, only option ‘d’ is true i.e., trophozoites and cysts are found in duodenum. About other options

.        The gold – standard for diagnosis of giardiasis is microscopic demonstration of the trophozoite, cyst or both in feces (not C.F.T.).

.        Stools contain both cyst and trophozoite.

.        The normal habitat is duodenum and upper jejunum (not colon).


Q. 7

Which of the following is true about giardia –

 A

CFT is diagnostic

 B

Trophozoites and cysts are seen in man

 C

Lives in lower intestine

 D

Invades normal mucosa

Q. 7

Which of the following is true about giardia –

 A

CFT is diagnostic

 B

Trophozoites and cysts are seen in man

 C

Lives in lower intestine

 D

Invades normal mucosa

Ans. B

Explanation:

Ans. is ‘b’ i.e., Trophozoites & cysts are seen in man


Q. 8

Diagnose the infection based on organism shown in the photograph below ? 

 A

Leishmaniasis.

 B

Amoebiasis.

 C

Giardiasis.

 D

Acanthamoeba.

Q. 8

Diagnose the infection based on organism shown in the photograph below ? 

 A

Leishmaniasis.

 B

Amoebiasis.

 C

Giardiasis.

 D

Acanthamoeba.

Ans. C

Explanation:

Giardiasis is a major diarrheal disease found throughout the world. The flagellate protozoan Giardia intestinalis­­ (previously known as G lamblia), as shown in the picture above is its causative agent, is the most commonly identified intestinal parasite in the United States and the most common protozoal intestinal parasite isolated worldwide. Infection is more common in children than in adults.

G intestinalis can cause asymptomatic colonization or acute or chronic diarrheal illness. The organism has been found in as many as 80% of raw water supplies from lakes, streams, and ponds and in as many as 15% of filtered water samples. It is a common cause of chronic diarrhea and growth retardation in children in developing countries.

Giardiasis usually represents a zoonosis with cross-infectivity between animals and humans. Giardiaintestinalis has been isolated from the stools of beavers, dogs, cats, and primates. Beavers may be an important reservoir host for G intestinalis.Other Giardia species include G muris in rodents; G agilis in amphibians; G psittaci and G ardeae in birds; and G microti in voles and muskrats.



Leave a Reply

%d bloggers like this:
Malcare WordPress Security