A practice is using an FeLV test with a sensitivity of 90% and a specificity of 95%.
Assuming the prevalence of feline leukemia in the area is 5%, what is the predictive
value negative (PVN) of the test?
A - 55%
B - 45%
C - 99%
D - 75%
E - 88%
Give this one a try later!
, C - 99%
The trick is to pick an imaginary number of animals you'd like to test, 1000,
and fill a 2x2 table from there. If 5%, then 50/1000 cats with FeLV and 950
disease free. 95% specificity calls 902/950 disease-free correctly and
incorrectly call 48/950 positive (false pos). 90% senstitivity calls 45/50
correct and 5/50 incorrectly negative (false negs).
correct neg / (correct neg + false negs) = 902/ (902 + 5) = 99%
What kind of organism causes equine granulocytic anaplasmosis?
A - Chlamydia
B - Ehrlichia
C - Protozoa
D - Anaplasma
E - Spirochete
Give this one a try later!
D - Anaplasma
Renaming due to DNA sequencing studies. Formerly ehrichia equi but now
called anaplasma phagocytophilium.
Two eight-week old calves are presented down and extremely weak.
They are depressed and lying in pools of foul-smelling brown diarrhea with a small
amount of blood.
Another calf died suddenly the previous night with no prior signs.
The down calves are dehydrated, with rectal temperatures of 105.2° and 105.6° F (40.7°
- 40.9° C) [N=101.5°-103.5°F, N=37.8°-39.7° C], respectively.
What is the treatment plan?
A - IV fluids; NSAIDS; frequent milk feedings
, B - Corticosteroids; amprolium in water; rumensin in feed
C - Isolate sick calves; oral electrolytes
D - Immunize calves and adult cattle with MLV vaccine; probiotics for sick calves
E - Cull sick calves; prophylactic oxytetracycline in feed for well animals
Give this one a try later!
A - IV fluids; NSAIDS; frequent milk feedings
Fever, diarrhea, and sudden death in 8-wk old calves is highly suggestive of
septicemia due to salmonellosis. Isolate sick calves. Antibiotic use is
controversial as they may prolong recovery and yield a carrier calf.
Prognosis is poor with neonatal animals.
A six-year-old female spayed cocker spaniel is presented with a two-day history of
lethargy. Upon physical exam, mucosal petechiae and ecchymoses and an ocular
hemorrhage in the right eye are noted.
Prothrombin time (PT) and activated partial thromboplastin time (aPTT) testing are
normal. A buccal mucosal bleeding time (BMBT) is performed and is prolonged. Click
the labwork icon to review hematology, blood chemistry, and urinalysis test results.
Which one of the following diseases is the most likely diagnosis?
A - Von Willebrand's disease
B - Anticoagulant rodenticide toxicity
C - Immune-mediated thrombocytopenia
D - Disseminated intravascular coagulation (DIC)
E - Hepatic insufficiency
Give this one a try later!
C - Immune-mediated thrombocytopenia, lab shows low platelets,
increased bleeding time. This is the most common cause of spontaneous
bleeding in dogs. 2x as common in females.
Assuming the prevalence of feline leukemia in the area is 5%, what is the predictive
value negative (PVN) of the test?
A - 55%
B - 45%
C - 99%
D - 75%
E - 88%
Give this one a try later!
, C - 99%
The trick is to pick an imaginary number of animals you'd like to test, 1000,
and fill a 2x2 table from there. If 5%, then 50/1000 cats with FeLV and 950
disease free. 95% specificity calls 902/950 disease-free correctly and
incorrectly call 48/950 positive (false pos). 90% senstitivity calls 45/50
correct and 5/50 incorrectly negative (false negs).
correct neg / (correct neg + false negs) = 902/ (902 + 5) = 99%
What kind of organism causes equine granulocytic anaplasmosis?
A - Chlamydia
B - Ehrlichia
C - Protozoa
D - Anaplasma
E - Spirochete
Give this one a try later!
D - Anaplasma
Renaming due to DNA sequencing studies. Formerly ehrichia equi but now
called anaplasma phagocytophilium.
Two eight-week old calves are presented down and extremely weak.
They are depressed and lying in pools of foul-smelling brown diarrhea with a small
amount of blood.
Another calf died suddenly the previous night with no prior signs.
The down calves are dehydrated, with rectal temperatures of 105.2° and 105.6° F (40.7°
- 40.9° C) [N=101.5°-103.5°F, N=37.8°-39.7° C], respectively.
What is the treatment plan?
A - IV fluids; NSAIDS; frequent milk feedings
, B - Corticosteroids; amprolium in water; rumensin in feed
C - Isolate sick calves; oral electrolytes
D - Immunize calves and adult cattle with MLV vaccine; probiotics for sick calves
E - Cull sick calves; prophylactic oxytetracycline in feed for well animals
Give this one a try later!
A - IV fluids; NSAIDS; frequent milk feedings
Fever, diarrhea, and sudden death in 8-wk old calves is highly suggestive of
septicemia due to salmonellosis. Isolate sick calves. Antibiotic use is
controversial as they may prolong recovery and yield a carrier calf.
Prognosis is poor with neonatal animals.
A six-year-old female spayed cocker spaniel is presented with a two-day history of
lethargy. Upon physical exam, mucosal petechiae and ecchymoses and an ocular
hemorrhage in the right eye are noted.
Prothrombin time (PT) and activated partial thromboplastin time (aPTT) testing are
normal. A buccal mucosal bleeding time (BMBT) is performed and is prolonged. Click
the labwork icon to review hematology, blood chemistry, and urinalysis test results.
Which one of the following diseases is the most likely diagnosis?
A - Von Willebrand's disease
B - Anticoagulant rodenticide toxicity
C - Immune-mediated thrombocytopenia
D - Disseminated intravascular coagulation (DIC)
E - Hepatic insufficiency
Give this one a try later!
C - Immune-mediated thrombocytopenia, lab shows low platelets,
increased bleeding time. This is the most common cause of spontaneous
bleeding in dogs. 2x as common in females.
