TBD

Question 1

What is the causative agent of fowl cholera?

Answer 1

Pasteurella multocida

Question 2

A herd of ewes had an abortion storm in which 80% of animals are affected. All stages of gestation are affected, and lambs that are born are very weak. On the placentas, cotyledons have white foci of necrosis. What’s your primary differential?

Answer 2

Toxoplasma gondii
Pathognomonic signs of T.gondii are bright to dark red cotyledons w/white foci of necrosis… intercotyledonary areas of placenta are normal

Question 3

A 3-year-old MN lab from the Ohio River valley basin presents w/chronic lg bowel diarrhea & signs of respiratory dz (cough, fever). A LN smear shows round-ovoid encapsulated structures inside MF & giant cells. The organisms have thin cell walls, w/thin clear zone b/t cell wall & cytoplasm. What’s the Dx?

Answer 3

Histoplasmosis
River valleys of US; associated w/bird & bat droppings in soil
Big dDx is Blastomycosis —respiratory presentation, easier to see on H&E stain

Question 4

An adult tortoise presents w/recent history of cloacal straining and depression. Gentle manipulation/rocking of the animal allows palpation of a firm, coelomic structure. What’s the presumptive dx?

Answer 4

Retained eggs (need rads to detect)