[Ken H]

What the WHO, CDC et al are all trying to understand is that “RO” is now a completely meaningless concept.

What is 'RO'?

[Black Agnes]

https://en.wikipedia.org/wiki/Basic_reproduction_number

[ElenaM]

R0 is how many people an infected person infects. So if a patient infects 3 others, that patient’s R0 is 3. It’s a statistic used to determine whether a communicable disease is spreading (R0 greater than 1), steady (R0 = 1) or receding (R0 less than 1).