test 3 toxo

Question 1

Describe the life cycle of Toxoplasma gonii.

Answer 1

Sexual cycle occurs in a cat. micro and macro gametes are formed in the stomach. oocysts are formed and are pooped out. oocysts hatch into sporozoites which are eaten by a mouse. In the mouse the sporozoites become tachyzoites, which can be passed onto a fetus. In a chronic infection the tachyzoites become bradyzoites in tissue cysts. The mouse is eaten by a cat, completing the cycle.

Question 2

Which two types of tissues do bradyzoites live in?

Answer 2

muscle and brain.

Question 3

Which form of the parasite causes infection in cats?

Answer 3

Bradyzoites.

Question 4

What is the most common protozoan infection?

Answer 4

T. gondii

Question 5

How long does it take for T. gondii oocysts to sporulate?

How long do they remain infectious for?

Answer 5

2 days

1 year.

Question 6

How many AIDs patiens develop toxoplasmic encephalitis?

Answer 6

around 30%

Question 7

What is the treatment for toxo?

Answer 7

Daraprim (pyrimethamine)

Question 8

What two animals does sarcocystis go through?

Answer 8

Cattle and dogs

Question 9

What is the rice breast in ducks?

Answer 9

S. suihominis

Question 10

What is the major problem with Neospora caninum?

Answer 10

leading cause of stillbirths in cattle and abortion in the U.S.