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Basic reproduction number - Wikipedia

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In epidemiology, the basic reproduction number, or basic reproductive number (sometimes called basic reproduction ratio or basic reproductive rate), denoted 𝑅 0 (pronounced R nought or R zero),[1] of an infection is the expected number of cases directly generated by one case in a population where all individuals are susceptible to infection.[2] The definition assumes that no other individuals are infected or immunized (naturally or through vaccination). Some definitions, such as that of the Australian Department of Health, add the absence of "any deliberate intervention in disease transmission".[3] The basic reproduction number is not necessarily the same as the effective reproduction number 𝑅 (usually written 𝑅 𝑡 [t for "time"], sometimes 𝑅 𝑒 ),[4] which is the number of cases generated in the current state of a population, which does not have to be the uninfected state. 𝑅 0 is a dimensionless number (persons infected per person infecting) and not a time rate, which wo

Basic reproduction number - Wikipedia Jump to content From Wikipedia, the free encyclopedia Metric in epidemiology This article is about the rate of spread of an epidemic. For the average number of offspring born to a female, see Net reproduction rate . "R number" redirects here. For other uses, see R-value . R 0 {\displaystyle R_{0}} is the average number of people infected from one other person. For example, Ebola has an R 0 {\displaystyle R_{0}} of two, so on average, a person who has Ebola will pass it on to two other people. In epidemiology , the basic reproduction number , or basic repro

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