Abstract

Following a gradual increase in COVID-19 cases in early February, the Île-de-France region experienced rapid community spread in March, with the epidemic peaking in week 13, from March 23 to 29. The impact of the epidemic was significant in the Île-de-France region. Residents of the region accounted for approximately 40% of COVID-19 deaths recorded in France since March 1, whether in hospitals or nursing homes.
The lockdown was followed by a sharp decline in COVID-19-related healthcare utilization, first observed in outpatient settings during week 14, from March 30 to April 5, and then in hospitals starting April 7, which continued through week 24, from June 8 to 14—five weeks after the lockdown was lifted. This downward trend came to a halt in week 25.
The epidemic thus remains active in the region, with 32 hospitalizations for COVID-19 each day (average for the week of June 17–23). The hospitalization rate remains 2.4 times higher than that observed in all other regions combined. This level of regional excess incidence has remained stable over the past month.
When considering the earliest indicators, the situation in the Île-de-France region is converging with that of mainland France, with a standardized incidence rate from PCR tests slightly above the national average (5.7 vs. 4.4 per 100,000 inhabitants). However, there is a disparity among departments, with a test-based incidence rate of 8.7 in Val-d'Oise compared to 3.3 in Seine-et-Marne.
Control of the epidemic now relies primarily on cluster containment in a context of moderate but stabilized viral circulation in the general population, with interdepartmental incidence contrasts ranging from one to three for key indicators (infections, hospitalizations).