New COVID variants may be more transmissible but that doesn't mean the R0 – or basic reproduction number – has increased

During the pandemic we have all become familiar with a lot of epidemiological concepts.

One that was introduced to us early in 2020 is the “basic reproductive number”, or R0. This tells us about the intrinsic contagiousness of a virus, or its inherent capacity to be spread from one person to another in a particular population.

We also learned about the “effective reproductive number”, or Reff. This tells us about the rate at which a virus is actually spreading through that population.