Exam 2: Bovine Infectious Infertility and Abortion Flashcards
Early embryonic death is defined as fetal death occurring
before _______ weeks gestation
8 weeks
Still birth is defined as fetal death occurring at
greater than _________ days
260 days
Intervention level for infectious infertility and abortions is
> ____% of the herd
>5%
The #1 diagnosis of abortion is _________
UNKNOWN!
In cases of abortion, what tissues at a minimum should be
submitted for diagnostics?
Placenta, Fetus, Maternal Blood
Describe the shape of Listeria monocytogenes
Gram positive coccobacillus
This bacterial cause of abortion in cows is concentrated in
rotting hay and improperly stored silage
Listeria monocytogenes
Listeria monocytogenes causes abortion in
which trimester?
Listeria monocytogenes causes abortion in the
last trimester
This is one of the few causes of abortion in cattle that you
actually see sick, infected cows before, during, and after abortion,
along with encephalitis and neonatal disease
Listeria monocytogenes
Upon necropsy of an aborted fetus,
you notice the fetus is autolysed.
The liver shows foci of necrosis, but you have ruled out BHV-1.
What is your primary ddx?
Listeria monocytogenes
The placenta described below most relates to which bacterial cause of abortion?
Pinpoint yellow necrotic foci
on the tips of cotyledonary villi
with intercotyledonary placentitis
Listeria monocytogenes
What is the treatment for Listeria monocytogenes?
No treatment, cow recovers.
Prevention aimed at proper feed and silage storage
All serovars of this aerobic spirochete bacteria are zoonotic
Leptospirosis
Host-adapted Leptospirosis that result in
insidious repro loss and infertility include
these 2 strains
- L. interrogans hardjo-prajitno* (USA)
- L. borgpetersenii hardjo-bovis* (UK)
Name the 4 types of Leptospirosis that are non-host adapted
and responsible for abortion storms
- L. pomona*
- L. grippotyphosa*
- L. icterohemmorhagica*
- L. canicola*
Leptospirosis has an incubation period of _________ days
4 - 10 days
Leptospirosis localizes and persists in the _________
renal tubules
T/F:
Leptospirosis infection has pathognomic clinical signs
that all animals show if infected
FALSE!
Often NO clinical signs with lepto infection
How is Leptospirosis transmitted?
Urine
Placental fluids
Milk
Transplacental
Semen
Leptospirosis can survive in a wet enviroment for ______ days
30 days
How is Leptospirosis diagnosed?
Via clinical history of INFERTILITY and ABORTIONS
plus fluorescent antibody test
of maternal urine after FUROSEMIDE administration
What type of vaccine protects from non-host adapted Leptospirosis?
multivalent vax
What type of vaccine protects from host adapted Leptospirosis?
monovalent vax
During an outbreak, how is Leptospirosis controlled?
Vaccine + TETRACYCLINES
This gram negative intracellular coccobacillus
was once the most important repro disease of cattle in the USA.
Thank to an eradication program, most states are free,
but we must remain vigilant because the associated
zoonosis results in undulant fever
Brucella abortus
How is Brucella abortus transmitted?
Primarily via mucous membranes
Where does Brucella abortus multiply?
chorioallantoic trophoblasts resulting in
chorioallantoic necrosis and fetal bacteremia
T/F:
Bulls can be carriers for Brucella abortus and transmit it via coitus with the cow,
which is why all sire bulls should test negative for it
True
(But transmission via coitus is rare)
When do abortions typically occur if a cow is infected with Brucella abortus?
After 5 months gestation
Following abortion around 5 months due to Brucella abortus,
what sequela can you see in the cow?
Retained fetal membranes, Metritis
What tissues can be submitted to confirm diagnosis of
Brucella abortus?
FETAL lung, abomasum
Placenta
Uterine tissues
What might the placenta of a cow infected with Brucella abortus
look like?
dry, thickened, or cracked intercotyledonary areas, moroccan leather
How do you treat cows that test positive for Brucella abortus?
NO treatment, CULL
You go to a farm and the farmer tells you his cows have been aborting
around 5 months gestation. Afterwards, some cows experienced
retained fetal membranes and metritis. What is your primary differential,
and what is the first thing you do?
Brucella abortus
report it to authorities!
How is Brucella abortus prevented?
Vaccination of HEIFERS ONLY
What is the name of the vaccine used in heifers (not males!) to
prevent Brucella abortus?
RB51 (Bang’s Vaccine)