Throughout the Covid-19 pandemic we have been repeatedly bombarded with a statistic called R0 (often referred to as the “basic reproductive rate”), whether from the Government or the news channels, as a way of describing how SARS CoV2 is spreading in the community. By now most of know what it is; it’s the number of people that a person with an infection will infect. If R0 >1 then the initial “outbreak” is expanding, if R0 <1 it is shrinking.
But, the Government and the news have been using it incorrectly… and as a result so have a lot of us. Let me explain….