Key Points

COVID-19

• Continued decline in viral circulation observed across various virological surveillance indicators (incidence rate, positivity rate, and testing rate). This trend is observed across all age groups and all departments.

• The BA.2 sublineage is predominant, accounting for 95.6% of interpretable sequences from the Flash S19 survey (05/09); there has been an increase in the proportion of samples carrying the L452 (C1) mutation (2.3% in S20 vs. 4.9% in S21).

• Decrease in emergency room visits for suspected COVID-19.

• Decrease in new hospitalizations and stabilization of new admissions to critical care.

• Decrease in the number of COVID-19 cases in ESMS.

Acute gastroenteritis

• In week 21, activity related to gastroenteritis was down in hospital emergency departments

• Oscour®: moderate activity level in week 21; the number of hospital emergency department visits for gastroenteritis (n = 155) was down compared to the previous week (n = 230) and accounted for 1.3% of coded visits (1.7% in week 20). Activity related to gastroenteritis was higher than that observed in 2021 and 2020 during the same period. Among children under 5 years of age, activity related to gastroenteritis was down compared to the previous week (4.5% vs. 8.6% in week 20).

• In week 21, the hospitalization rate was 20.6% (21.1% among children under 5 years of age), stable compared to the previous week (20.9% in week 20), and gastroenteritis accounted for 1.5% of the total number of hospitalizations (2.0% in week 20).

• Sentinel Network: In Week 21, the regional incidence rate of outpatient visits for acute diarrhea was estimated at 51 cases per 100,000 population (95% confidence interval: [13–86]), an increase compared to the consolidated incidence rate for week 23 (30 cases per 100,000 inhabitants, 95% confidence interval: [6–54]).