Attack rate
Attack rate is a term used in epidemiology to denote the proportion of people who become ill after exposure to an infectious disease. It is a measure of the risk of illness in those exposed to the disease, and is often used in outbreak investigations to help identify the source of the infection.
Pronunciation
The term is pronounced as /əˈtæk reɪt/.
Etymology
The term "attack rate" is derived from the field of epidemiology. The word "attack" is used in the sense of an onset of illness, while "rate" refers to the proportion of a population affected.
Definition
The attack rate is defined as the number of new cases of a disease in a population at risk during a specified time period, divided by the number of individuals at risk of the disease during that time period. It is usually expressed as a percentage.
Calculation
The attack rate is calculated by dividing the number of new cases of a disease by the total number of individuals at risk during the specified time period, and then multiplying the result by 100 to express it as a percentage.
Related Terms
- Incidence rate: The number of new cases of a disease in a population over a specified time period.
- Prevalence rate: The total number of cases of a disease in a population at a specific time.
- Morbidity rate: The rate of disease in a population.
- Mortality rate: The rate of death in a population.
See Also
External links
- Medical encyclopedia article on Attack rate
- Wikipedia's article - Attack rate
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