Understanding the Reproduction Definition Understanding the Reproduction Definition.

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Presentation transcript:

Understanding the Reproduction Definition Understanding the Reproduction Definition

Reproduction Ratio (R 0 ). Definition It is the expected number of secondary cases produced by a primary case Ex. R 0 =4

Prevalence Nb of infected animals Time The pathogen is able to invade the susceptible population R 0 over 1

Prevalence Nb of infected animals Time The pathogen remains at the same level R 0 equal 1

R 0 below 1 Between-animal transmission cannot maintain a disease in a population Time Prevalence Nb of infected animals

. R 0 =1 Prevalence Nb of infected animals Time R 0 > 1 the pathogen is able to invade the susceptible population R 0 < 1 between-animal transmission cannot maintain a disease in a population Reproduction Ratio (R 0 ). Effect