Lecture 4

Question 1

What is required for an infection to occur? (2)

Answer 1

1. Overwhelming pathogen load

2. Compromised host defences

Question 2

What does disease/pathology/damage result from? (2)

Answer 2

1. Production of toxins

2. Invasion of tissues

Question 3

What organisms are saprophytes/environmental? (2)

Answer 3

Rhodococcus equi & Aspergillus

Question 4

What organism is a commensal?

Answer 4

CLostridium spiroforme

Question 5

What organisms are opportunistic pathogens? (3)

Answer 5

Staphylococcus app

Acinetobacter spp

Dermatophilus congolensis

Question 6

Opportunistic pathogen def

Answer 6

Can set up infection when given access to a normally sterile or protected site

Question 7

What are the 3 components of the epidemiological triad?

Answer 7

Favourable envy

Virulent agent

Susceptible host

Question 8

Zoonosis def?

Answer 8

Infectious diseases of animals which can be transmitted to humans