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Cumulative incidence (KI)

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(1)

DISEASE IN POPULATION

Cumulative incidence (KI)

In a population, the ratio of diseased animals to healthy animals at the beginning of the period is healthy at the beginning of a certain period,

KI does not depend on time dimension and takes a value between 0 and 1

If 10 dogs in a dog farm develop pneumonia within a week and there are 50 dogs at the beginning of the week, then for this week KI: 10:50 = 0,2

If more pneumonia develops in 10 dogs in the second week on the same farm, KI: 20:50 = 0.4 for two weeks

(2)

DISEASE IN POPULATION

The relationship between prevalence and incidence Prevalence depends on the duration and incidence of the disease

Reducing the incidence of the disease also reduces the prevalence

P = I x S

(3)

DISEASE IN POPULATION

Epidemiological rates

Morbidity = The ratio of sick animals to total population

Mortality = the proportion of dead animals to total population

Letalite = Ratio of dead animals to sick animals Raw mortality rate

Age-specific mortality rate Maternal mortality rate

Fetal death rate, etc.

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