Exam III - Cryptosporidium spp.

Question 1

Which spp. of Cryptosporidium spp. is infectious to humans, but not cattle or other animals?

Answer 1

C. hominis

Question 2

Which spp. of Cryptosporidium spp. infects calves (<3 weeks) and humans?

Answer 2

C. parvum

Question 3

Which spp. of Cryptosporidium spp. infects older calves?

Answer 3

C. andersoni

Question 4

What is the infective stage for Cryptosporidium spp?

Answer 4

sporulated oocyst

Question 5

How soon are Cryptosporidium spp. oocysts infective after they are passed in the feces?

Answer 5

Immediately.

Question 6

What is/are the site(s) of infection for Cryptosporidium spp?

Answer 6

Epithelial cells of digestive & respiratory tracts

Question 7

Describe any treatment/prevention options for Cryptosporidium spp

Answer 7

There is **no effective treatment, **but filtering water helps prevent transmission

Question 8

What are the routes of transmission for Crytosporidium spp.?

Answer 8

inhalation or ingestion of the sporulated oocyte.

Question 9

Because internal autoreifection is possible with Cryptosporidium spp. What does that mean for immune sufficient vs immune deficient hosts?

Answer 9

contribution to the coniticity of the of certain cases of immune sufficent hosts and leathal hyperinfection to the immune deficient host.

Question 10

Id of Cryptosporidium spp. is made from 4 -8 um oocysts that are transparent and small. each oocyst contain __ sporozoites.

Answer 10

4