Taenia

Question 1

Which stage of the life-cycle is relavent in taenia infection?

Answer 1

The metacestodes as these can cause carcass condemnation.

Question 2

What is the appearance of a taeniid egg?

Answer 2

Striated and small (1/2 size of a strongyl egg)

Question 3

What is the beef tapeworm of humans?

Answer 3

T. saginata

Question 4

How is it contracted by humans/cattle?

Answer 4

Humans - eating undercooked beef

Cattle - contaminated pasture or utensils

Question 5

How does T. saginata asiatica differ?

Answer 5

It has pigs as an intermediate host.

Question 6

What is the main factor that seems to affect prevalence of T. saginata infection in humans?

Answer 6

Level of sanitation.

Question 7

How is meat inspected?

Answer 7

By making cuts into the heart, masseter and tongue.

Question 8

How could the adult of T. solium be distinguished from that of T. saginata?

Answer 8

It is aremed whereas T. saginata is not.

Question 9

How could T. solium potentially be dangerous to a human>

Answer 9

Cysticerci can develop in the brain and musculature of the human.

Question 10

How can Taeniid eggs be distiguished from those of Dipydium?

Answer 10

Taeniid segments are
Rectangular
Have one lateral genital pore
Have single eggs (not in packets)

Question 11

What spp. are infected by:

1. T. ovis
2. T. hydatigena
3. T. pisiformis
4. T. serialis
5. T. taeniaeformis

Answer 11

1. Sheep - found in the musculature
2. Sheep and others - infect liver (fibrotic tracts) then peritoneal cavity
3. Similar to above but found in omentum of rabbits
4. Rabbits - intermuscular connective tissue leading to subdermal swelling
5. Cats - from eating infected mice