Test and tracing is launching today but it will need to be massively stepped up to have an impact, says David Hunter, professor of epidemiology at the University of Oxford
We all now know the basics – the R is the average number of people someone infected with Covid-19 passes the virus on to. If it is greater than 1.0 the epidemic will grow exponentially. If it is less than 1.0 it will eventually disappear.
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