Lymphoreticular Dz - Ag Flashcards
1
Q
Sporadic LSA vs Enzootic (BLV) LSA in cattle
*Most common neoplasm of DAIRY cattle
A
Enzootic:
- common
- infectious = BLV
- adult cattle
- once infection established, animals are INFECTED and SEROPOSITIVE for life!
Sporadic:
- rare
- non-infectious
- young
2
Q
How is BLV transmitted? How can we reduce the transmission risk?
A
Transmission:
- blood transfer –> almost any secretion/excretion can contain lymphs and thus virus
- direct physical contact
- IA blood transfer
- Semen
- Embryo transfer - + recipient to calf
**Only 2% of cattle with BLV have clinical LSA
Control:
- eradication possible but O must be committed
- most often, manage and try to reduce transmission
3
Q
Explain the common tissue sites of LSA in adult cattle
A
HAULS!
- heart (right atrium)
- abomasum
- urogenital
- LYMPH nodes (>90%)
- spinal cord
4
Q
How does LSA manifest in other livestock species
A
Goats - thymic LSA
Camelids - lymphoma (multicentric and generalized)
5
Q
Identify the cause, diagnosis, and clinical management of anthrax in ruminant livestock
A
Cause:
- Bacillus anthracis
- Gram+ rod
- highly resistance, can survive for decades
Dx:
- DON’T open carcass!
- *Sample for culture & cytology
- blood smear
- dark hemorrhage from orifices
- failure of blood to clot
- absence of rigor mortis
- “blackberry jam” spleen
Management:
- warn lab you are sending samples
- clost and protect remains
- call state/fed vet
- quarantine
- incinerate remains and disinfect areas
- vaccination
6
Q
Identify the cause, CS, Dx, and Tx of caseous lymphadenitis in small ruminants. How do you manage CL in a herd/flock?
A
Cause:
- Corynebacterium pseudotuberculosis
- Gram+ rod
CS:
- internal & external forms
- weight loss
- abscesses
- enlarged LN
- resp dz
Dx:
- culture and gram stain a must
- serology –> measures Abs to C pseudotb toxin
Tx:
- no cure
- sx removal –> potential to pop
- drain abscess
- Abx & vaccines
- ZOONOTIC
Herd management:
