Key points

Chikungunya, dengue, Zika

• Since the start of enhanced surveillance in the region, 318 cases of arboviral diseases—270 confirmed cases and 48 probable cases—have been investigated in Île-de-France, including 307 cases of dengue, 3 cases of chikungunya, 6 cases of Zika, and 2 cases of dengue/chikungunya co-infection. All of these cases were imported (Table 1 and Figure 2). Fifty-six hospitalizations for dengue and 2 for chikungunya were reported. No deaths were recorded.

• The dengue cases were imported from the Caribbean (205), Latin America (43), Asia (41), and sub-Saharan Africa (17); chikungunya cases from Mali, Senegal, and Côte d’Ivoire; the 6 Zika cases from Thailand; and the co-infection cases from India (Figure 3). Among the cases, 272 (86%) were potentially viremic in the Île-de-France region, and 125 (39.3%) resided in municipalities in the region colonized by the “tiger mosquito” (Aedes albopictus).

Extreme heat, heat wave

• In Week 37, the Île-de-France region was at orange alert level on September 11, 2023. iCanicule indicators for emergency room visits and SOS Médecins calls decreased compared to Week 36, and case numbers remain low.

• Heat wave monitoring continues through the end of September 2023. The Île-de-France region is under a green alert in Week 38 as of the publication date of this epidemiological update.

COVID-19

• Emergency department visits (OSCOUR) related to COVID-19 are stable compared to the previous week. SOS Médecins calls continue to increase compared to previous weeks. The number of visits followed by hospitalizations decreased slightly in Week 37 (147) compared to the previous week (166).

• A 4% increase in infection cases (positive* SARS-CoV-2 test results via RT-PCR and antigen tests) in Week 37 compared to the previous week. The testing rate is 118 cases per 100,000 inhabitants.