R number refers to “reproduction number”, which is the average number of secondary infections produced by a single infected person.
If R is greater than 1 the epidemic is growing.
If R is less than 1 the epidemic is shrinking.
If R is equal to 1 the total number of infections is stable.
Use “reproduction number (R number)” and define it as “the average number of secondary infections produced by a single infected person” the first time you use it. You can refer to “R number” after that.
Do not use:
- “R Number” with both capitalised
- “r number” with both lower case