Lecture 3

Question 1

source of infection for an animal

Answer 1

place where at least one minimal infectious dose of pathogen is present

Question 2

primary SOI

Answer 2

sick animal
carrier animal
animal products
animal by-products
animal carcasses
wild animals
arthropods

Question 3

what is a carrier

Answer 3

animal that harbours a specific infectious agent and shedding it in at least minimum infective dose without observable clinical disease

Question 4

time and progression of disease

Answer 4

incubation period
prodromal period
period of ilness
peroid of decline
period of convalsence

Question 5

intermediate SOI

Answer 5

excretions of sick animals
excretions of carrier animals

Question 6

2ndary SOI

Answer 6

soil (anthrax, malignant oedema, black leg)
water (lepto)
air (q-fever)
food
- forage contamination occurs in 2 ways
– on field where cultivated (anthrax)
– during prep and storage (listeria+botulism)
contaminated objects
contaminated premises
contaminated means of transport