With more than 3,900 PCR and antigen tests carried out in the seven days to Sunday, July 11, the coronavirus infection rate per 100,000 population has jumped to 91.26 from 41.72 one week earlier.
The Government has attributed the recent uptick in new cases to younger holidaymakers returning from Spain and then contaminating family members.
The benchmark rate in the neighbouring Alpes-Maritimes now stands at 52, according to Public Health France.
The Government is urging everyone to come forward for vaccination and has now opened the free service to non-resident employees over the age of 50.
Two new cases of coronavirus were reported on Monday, July 12, and five full recoveries.
One resident has been discharged from Princess Grace Hospital. Three non-residents are also receiving treatment for coronavirus, one of them in intensive care.
Meanwhile, 32 residents with mild symptoms are recovering at home under the care of the Home Monitoring Centre.