arteriviridae

Question 1

arteriviridae general characteristics

genetic material

enveloped?

viruses

Answer 1

ssRNA

enveloped

PRRSV

**2 antigenic types and 6 structural proteins that produce neutralizing antibodies

Question 2

PRRSV (porcine repo and resp syndrome)

1. types of dz virus causes
2. method of transmission
3. zoonotic?
4. does it change/recombine/mutate
5. distribution
6. diagnosis
7. differential diagnosis
8. control

Answer 2

1. anorexia, fever in sow farm. LATE TERM ABORTION AND EARLY FARROWING, in the nursery form respiratory dz complex
2. transmission from incoming breeding stock, infection by respiratory route, in utero infection, semen. has affinity for alveolar macrophages. VIREMIC for 35 days
   - if infected in early gestation –> failure of conception
   - if infected midgestation –> no signs
   - if infected late –> most obvious. weak, mummified piglets
3. not zoonotic
5. europe and usa
6. IFA, ELISA, SN (after 35 days), virus isolation and pcr on serum/ lung of piglets, histopath of lung
7. differential diagnosis- pseudorabies (but no early farrowing), porcine circovirus?
8. control- vaccinate. but be careful when putting vaccinated and nonvaccinated pigs together bc can still transmit virus.