Create an account
How does Infectious Disease Persist in a Population?
What is an Endemic?
consistently present in defined population
Hyperendemic is a disease at continuously high levels
What is Sporadic?
each occurrence can be a single case or in a cluster
What is the epidemic curve?
graphical representation of new cases of disease
vertical axis - new cases
horizontal axis - time
What is common source epidemic?
all cases exposed to a single common source (brief)
not specific to infectious disease
What is propagating epidemic?
animals initially infect other animals which in turn infect further animals
What 3 cases can be identified with propagating epidemic?
first case known to investigators
may be determined after trace-back
infected from primary case(s)
occur after one incubation period
How can a Propagating Epidemic Occur?
there must be enough susceptible animals in the population
infectious individuals must, on average, infect at least one susceptible individual each during the infectious period
What is the Reed-Frost Model
population is divided into 3 groups
infected - rise and fall
susceptible - fall over time
immune - increase over time
What are the Reed-Frost Model Assumptions?
only direct transmission or infection occurs
it's a closed population - no animals can be added
all parameters constant throughout simulation period
What is Herd Immunity?
protection of susceptible members of population by presence of immune animals
susceptible animals less likely to become infected
Please allow access to your computer’s microphone to use Voice Recording.
Having trouble? Click here for help.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!Reload
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Please upgrade Flash or install Chrome
to use Voice Recording.
For more help, see our troubleshooting page.
Your microphone is muted
For help fixing this issue, see this FAQ.
Star this term
You can study starred terms together