R value
R Value (Medicine)
The R value (pronounced: /ɑːr væljuː/) is a term used in epidemiology to denote the average number of people that one infected person will pass on a virus to, in a population where everyone is susceptible.
Etymology
The term "R value" is derived from the word "reproduction", referring to the reproduction rate of a virus. The "R" stands for the reproduction number, which is a key factor in gauging the severity of infectious diseases such as COVID-19.
Related Terms
- Basic reproduction number (R0): This is the number of cases, on average, an infected person will cause during their infectious period in a population where everyone is susceptible.
- Effective reproduction number (Rt or Re): This is the number of cases, on average, an infected person will cause during their infectious period in a population where some people are immune or have been vaccinated.
- Infectious period: This is the period during which an infected person can spread the disease to others.
- Susceptible: This refers to individuals in a population who are not immune to an infectious disease and thus are potential hosts for transmission.
See Also
External links
- Medical encyclopedia article on R value
- Wikipedia's article - R value
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