Measuring Disease Frequency Flashcards
What is Infectivity?
The ability of an organism to invade you and multiply within you
What is Pathogenicity?
Ability of organism to produce noticeable illness in you
What is Virulence?
Ability of an organism to cause severe disease
What is the formula for Virulence?
(# who develop severe disease/total # infected) * 100
What are we calculating when death is used in the numerator for virulence?
Case-fatality ratio
What Natural history of a disease do we take note of?
- Asymptomatic duration of illness
- Length of disease after diagnosis
- Most common clinical endpoint
What is the Symptomatic phase (of iceberg concept of disease)?
The clinical phase of disease that can be easily seen
What is the pre-symptomatic phase (of iceberg concept of disease)?
Period when pathogenesis is occurring but not clinically detectable
What ethnicity is most at risk for Celiac Disease?
Caucasians
When should health systems consider screening programs for diseases?
When they have a long asymptomatic phase
What are the clinical endpoints of disease?
- Recovery/Remission
- Disability
- Death
- Another disease
What is the simplest measure of disease?
Counts
What are counts?
the # of cases of a disease
