Topic 4; Prevention and control of infectious diseases

Question 1

Vet Admin rules

Answer 1

Aim - prevent import of agent, localisation of the disease, prevent spreading and eliminate it

notifiable; if you think you have diagnosed a notifiable disease, must inform local official vet, who will examine and confirm –> case must be reported

International transport - vaccination certs, pet passports

Certs, traceability

Import restrictions, only healthy animals can be imported

Question 2

Hyper immune sera Passive immunisation

Answer 2

contains ab against an infective agent

Question 3

Maternal Immunity - Passive immunisation

Answer 3

mammals, obtain maternal ab via colostrum, birds via yolk

IG important in first 2 weeks, as immune response not active until 5th well

Question 4

Placental types

Answer 4

Eq, ru, su have Epitheliochorial. IG cannot pass placenta, only through colostrum

Sheep : mainly colostrum, they have one layer less than epi

Dogs and cats ; endotheliochorial
- transplacentla and colostrum, but most through colostrum

calves, 0% absorbed at 27 hours also
5l in 24 hours

Question 5

Active immunisation

Answer 5

Vx host, induce a immune response, ab protect animal

Question 6

Live vaccines

Answer 6

Avirulent - do not cause disease
attenuated - decreased virulence but retain immunogenicity

Naturally and artificially anntenuated strains