Leukosis, Anaplasmosis, Etc.

Question 1

What bloodwork change in cows with BLV infections indicates that those cows are likely to be more infectious (and you could possibly use this information to select cows for culling to decrease spread of BLV)?

Answer 1

(Persistent lymphocytosis, WBC count of 10,000 or greater)

Question 2

(T/F) Sporadic bovine leukosis is not associated with a virus.

Answer 2

(T)

Question 3

Which form of sporadic bovine leukosis is described → cows with recurrent bloat, muffled heart sounds, +/- heart failure with distended jugulars, caudal ventral lung sounds difficult to hear, febrile?

Answer 3

(Thymic form)

Question 4

Which form of sporadic bovine leukosis is described → rare, usually cattle less than 30 months of age are affected, numerous lesions that enlarge over time, enlarged lymph nodes, and BCS/health deterioration over 6-12 months?

Answer 4

(Skin form)

Question 5

(T/F) The diarrhea of a cow with Johne’s disease is highly infectious.

Answer 5

(T)

Question 6

Why can you not confirm that cattle less than 18 months of age have Johne’s via serology?

Answer 6

(Bc Johne’s takes a long time to stimulate the immune system → antibody levels are not usually detected before 18 months of age)

Question 7

What diagnostic tests can be used to confirm a case of anaplasmosis?

Answer 7

(PCR or blood smear (look for morulae))

Question 8

What diagnostic test can be used to confirm a case of Theileria?

Answer 8

(PCR)

Question 9

What is the treatment of choice for anaplasmosis and does that same tx work for Theileria?

Answer 9

(Oxytet, no)

Question 10

What is the purpose of recommended tick and fly control to farmers who have anaplasma or theileria cases?

Answer 10

(Bc both are vector borne, specifically Haemaphysalis longicornis for Theileria and dermacentor/biting flies for anaplasma)