R-naught
Infection spread rate
R-naught (also written R₀ or R0) is an epidemiological measure of how contagious an infectious disease is—specifically, the average number of people one infected person will transmit the disease to in a population with no immunity.
An R-naught of 2 means each case typically produces two new cases.
When R-naught exceeds 1, an outbreak grows; below 1, it fades.
Measles has an R-naught around 15, making it extremely contagious.
Pathogen-caused transmissible ailment
- epidemicWidespread disease occurrence
- pandemicGlobal disease outbreak
- outbreakSudden eruption of trouble
- contagionDisease spread by contact
spread · herd immunity · infection rate · superspreader · contact tracing · secondary infections · pathogen · endemic
Spike-ringed viral family
- SARS-CoV-2Pandemic-causing coronavirus species
- variantsDiffering forms of something
- deltaSymbol denoting variation
- omicronFifteenth Greek letter
social distancing · flattening the curve · lockdown · mask mandate · viral load · breakthrough infection · vaccination rate · booster
Boundary-setting factor
- variableProne to fluctuation
- exponentialIncreasing by constant ratio
- logarithmicBased on exponents
- calculationMathematical problem-solving process
formula · simulation · projection · estimate · confidence interval · stochastic · deterministic · differential equation
infectious disease
Pathogen-caused transmissible ailment
- epidemicWidespread disease occurrence
- pandemicGlobal disease outbreak
- outbreakSudden eruption of trouble
contagion · spread · herd immunity · infection rate · superspreader · contact tracing · secondary infections · pathogen · endemic · exponential growth
coronavirus
Spike-ringed viral family
- SARS-CoV-2Pandemic-causing coronavirus species
- variantsDiffering forms of something
- deltaSymbol denoting variation
omicron · social distancing · flattening the curve · lockdown · mask mandate · viral load · breakthrough infection · vaccination rate · booster · quarantine
parameter
Boundary-setting factor
- variableProne to fluctuation
- exponentialIncreasing by constant ratio
- logarithmicBased on exponents
calculation · formula · simulation · projection · estimate · confidence interval · stochastic · deterministic · differential equation · curve fitting
- epidemiologyepidemic, epidemiology, pandemic, outbreak, endemic
R-naughtmortality rate
Deaths per population measured
case fatality rate · lethality · virulence · disease severity · death toll