Test 1: 4 BVD

Question 1

BVD causes — to be destroyed

Answer 1

peyers patches

Question 2

BVD type 2

Answer 2

severe mutation that causes hemorrhaging in wierd places

high fever, bloody diarrhea and death

thrombocytopenia → bleeding

immunosuppression

Question 3

two biotypes of BVD

Answer 3

cytopathic- kills cells
noncytopathic

Question 4

if dam is not vaccinated what happens with BVD

Answer 4

(if cow vaccinated- fetus protected)

Early pregnancy: embryonic death
Mid pregnancy: congenital defects, or abortion
Late pregnancy: abort, born weak

Question 5

how to form persistently infected calf

Answer 5

dam infected by non-cytopathic stain of BVD

at day 42-125

wont kill calf- become poor doers

Question 6

how to form chronic mucosal disease

Answer 6

PI calf
(calf thats mother was exposed to noncytopathic BVD at42-125 days gestation)

becomes exposed to cytopathic BVD strain or own BVD strain mutates

will be fatal, wasting, bleeding mouth, bleeding in tissues

Question 7

how to test for PI calves

Answer 7

ear punch

calves are so virus loaded that you can detect virus in their skin

take a skin biopsy IHC when placing ear tag