Order Trichurida

Question 1

*All with direct life-cycles
*Most species cosmopolitan
*Adults in large intestine,
rectum, caecum of mammals
*elongate (thread-like) at
anterior end, becoming thick
posteriorly
*stichosome present
*Eggs with bipolar plugs (50-55
x 22-23 um)

Answer 1

Trichuris sp.

Question 2

hemorrhaging occurs as whipworms
penetrate into the submucosal region and feed on
blood. Fatalities common in children.

Answer 2

Chronic anemia

Question 2

worms cause loss of muscle tone
in wall of rectum and it everts out the anus; whipworms
are often seen attached to the rectal tissue

Answer 2

rectal prolapase

Question 3

Treatment for whipworms

Answer 3

mebendazole

Question 4

*World’s largest intracellular parasite
*Adults intramulticellular in intestinal epithelium
*Larvae reside in skeletal muscle fiber
*Host serves both as definitive and intermediate host
*males 1.4-1.6 mm long; slender
*females 3-4 mm long; slender

Answer 4

Trichinella sp.

Question 5

Pathology of trichinella

Answer 5

1. Misdiagnosed as flue
2. Larval migration
3. penetration and encystment in skeletal muscles
4. calcification

Question 6

Treatment of trichinella

Answer 6

1. Thiabendazole/ albendazole- adults in the intestine
2. Mebendazole- invasive and encysted larval forms
3. Prednisone- Inflammation of infected tissues
4. Many drugs are effective against adults, but trichinosis
   is not suspected until larvae are in the muscles.