Sir Patrick Vallance speaking at daily coronavirus press briefing

The video explains the R number, which indicates how many people one infected person will infect. An R number above 1 means the epidemic grows, while below 1 means it shrinks. The R number is calculated using various models, and in the UK, it is currently between 0.7 and 0.9, indicating a decrease in epidemic size. Calculating R at regional levels is challenging, so growth rates and incidence are also important metrics. These help in understanding the epidemic's status and managing outbreaks.

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