EPI 2

Question 1

What is the episode infectious disease model?

Answer 1

Question 2

What are the direct modes of transmission?

Answer 2

ouching / Skin to skin (e.g., fungal infections)
– Kissing
– Sexual transmission (e.g., HIV, chlamydia)
- Vertical (from mother to child)
* In utero / birth canal / breast milk
– Diseases spread exclusively by direct contact usually
cannot survive outside of host for long period

Question 3

What are indirect modes of transmission?

Answer 3

Inanimate object (fomites)
– Becomes contaminated by pathogens from infected
individual or reservoir
– Usually can survive outside of host for prolonged period

Question 4

What is infective dose?

Answer 4

organisms
required to establish
infection in group of hosts

Question 5

What is the secondary attack rate?

Answer 5

Proportion of exposed
susceptible hosts who
develop disease

Question 6

What is pathogenicity?

Answer 6

Proportion of
infections resulting in clinically
apparent disease

Question 7

What is virulence?

Answer 7

Proportion of
clinically apparent cases
resulting in significant clinical
manifestations

Question 8

What is incubation period?

Answer 8

Time from exposure to first symptoms