Lecture 4 ANI SCI 320 : Introduction to Epidemiology Part 2 Flashcards
What is prevalence?
The total number or proportion of cases or events or conditions in a given population.
What is incidence?
number of new cases during a specified time period.
What is morbidity rate?
Number of deaths in a population due to a certain disease during a given period of time.
What is mortality rate?
The percentage of people with a specific disease that dies from that disease
What is attack rate?
Number of people affected by a disease divided by the number of people with a specific exposure.
What are the 4 disease occurence patterns?
- Endemic
- Sporadic
- Epidemic
- Pandemic
What is endemic?
A relatively steady frequency over a long period of time in a particular geographic locale
What is sporadic?
When occasion cases are reported at irregular intervals
What is epidemic?
Increasing prevalence of a disease beyond what is expected
What is a pandemic?
Epidemic across countries and continents
What does the basic reproductive number tell us?
The average number of new infections generated by one infection in a completely susceptible population.
Measure of the intrinsic potential of an infectious agent to spread
What does each variable stand for in the following equation
Rsub0 = C x P x D
C = contact time
P = Transmissibility
D = Duration of infectiousness
What does the effective reproductive number tell us?
A population will rarely be totally susceptible to an infection in the real world
What does each variable stand for in the following equation
R = Rsub0 x S
Rsub0 = Reproductive number
S = Fraction of the host population that is susceptible
When R = 1 outbreak is defined as..
Endemic
