Exam 2 - Infectious Infertility - Viral

Question 1

IBR

Infectious Bovine Rhinotracheitis

Answer 1

Bovine Herpesvirus 1 (BHV-1

most frequent dx cause of viral abortion in NA

can see abortion storms in naive cows

mid gestation abortions (4-8 mos) 5 mos

Dx: lesions suggestive

fetus autolysed

IHC & microscope confirms (intranuclear IB)

FA

Venereal form spontaneous resolve 1-2 weeks

Question 2

BVDV

Bovine Viral Diarrhea Virus

Answer 2

2 genotypes:

BVDV1 & BVDV2

2 biotypes:

Cytopathic

Noncytopathic- all PI calves

vertical transmission = make PI calves

horizontal transmission = from PI calves

Dx:

VI $$$ but gold standard

IHC (ear notch) ag sample $ maternal abs no interference

PCR $$ pooled samples; false +

Question 3

BVDV control strategy

Answer 3

PI animals reservoir for BVDV

Control programs: detect & eliminate PIs

Monitoring or surveillance

Several protocols used for herd screening

Question 4

Bluetongue virus

Answer 4

infects cattle & sheep

transmitted by Cullicoides

more CS sheep > cows

teratogenesis > abortion

cerebral malformations, weak calves, stillborns

Question 5

Aspergillus fumigatus

Answer 5

70% of fungal abortions in cattle

Dx:

placental necrosis ofcotyledons

fetal mycotic plaques

haphae on microscope or histopath