Infection rates in those regions are now above the England average.
In Rushcliffe rates increased by 40.3 cases per 100,000 men and women in the week ending June 5, to 97.3 cases per 100,000 men and women in the week ending June 12.
Nottingham city's prices have similarly risen from 46.6 to 87.4 throughout the timeframe.
Nottinghamshire Live requested public health officials if they think the county is currently entering its third wave in a briefing on Friday, June 18.
Jonathan Gribbin, public health director for the county, said it is currently believed Nottinghamshire, along with England, is in the"early stages" of yet another wave.
He explained:"When we go back a few months back in this meeting and other contexts we had been hearing concerning modelling from SAGE that was showing that in all likelihood in this calendar year we'd see a third wave.
"Nottinghamshire, along with the remainder of the country, now finds itself at what seems like to be the first stages of another wave.
"What we don't know in the moment and will be to a extend in our control, is what the and sharp the summit of that third wave will be and how long will survive.
"It's in our control it is within our present to be sticking with all the advice and constraints in Step 3. I'm urging people throughout the county, in view of the increase, to maintain all those steps in your mind."
Amanda Sullivan, the accountable officer for the NHS Nottingham and Nottinghamshire CCG, said the Delta version is 60 percent more transmissible, but people with both vaccine jabs are just two to three times more protected than after just an original vaccine.
Nottingham, according to the town's public health director David Johns, was one of the earliest areas in the nation to experience a"significant" cluster of cases of the Delta variant.
It is currently the dominant strain in the UK.
She added:"We are in a race against time to vaccinate as many individuals as you can to minimise the chances the Delta variant has to disperse."