COVID-19 Epidemiological Update for May 20, 2021: Four Consecutive Weeks of Declining Indicators
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Published weekly, the epidemiological update on COVID-19 surveillance provides a detailed analysis of the indicators established by Santé publique France and its network of partners to track the progression of the epidemic and inform public policy decisions.
In Week 19 (May 10–16, 2021), all epidemiological indicators continued to decline despite significant viral circulation in mainland France. The impact of this decline, observed over the past four weeks, on hospital pressure remains moderate. The number of people currently hospitalized and in critical care units remains high. Vaccination coverage continues to increase, with 14.7% of the population fully vaccinated as of May 18, 2021.
As collective restrictions are gradually lifted, it is essential that everyone maintain a high level of adherence to individual prevention measures, testing, and the isolation of cases and at-risk contacts. During this period of declining viral circulation, accelerated vaccination, and the lifting of restrictions, contact tracing is more essential than ever to controlling the epidemic. Finally, it is important to encourage priority groups who have not yet been vaccinated to get vaccinated.
A continuing downward trend
Nationwide, 87,957 new cases were confirmed in week 19, averaging nearly 12,600 cases per day. After accounting for the effect of public holidays (Saturday, May 8, and Thursday, May 13), the adjusted incidence rate for Week 19 was down by 12% (154 per 100,000 inhabitants in Week 19 vs. 174 in Week 18). The testing rate (3,759 per 100,000 inhabitants) increased in week 19 (+6%). The positivity rate was 4.1%, down 0.8 percentage points compared to week 18 (4.9%). The decrease in the incidence rate was observed across all age groups. The trend is more mixed in the overseas territories, particularly in French Guiana, where indicators were rising sharply, with an incidence rate of 445 per 100,000 inhabitants (vs. 315 in Week 18) and a positivity rate of 10.9% (vs. 9.7% in Week 18).
A sharp decline in hospitalizations but moderate impact on the hospital system
The decline in the number of reported new hospitalizations of COVID-19 patients and the number of new admissions to critical care units, which began in Week 16, has accelerated over the past two weeks. This decline was 31% and 33%, respectively, in Week 19 compared to Week 18. The impact of this reduction in new admissions on the number of people currently hospitalized is more moderate: with 22,118 people hospitalized on May 18 (vs. 25,088 on May 11, a decrease of 12%), including 4,030 patients in critical care (vs. 4,758, a decrease of 15%), the pressure on the hospital care system remains very high.
The #Flash 8 survey confirms the predominance of the 20I/501Y.V1 (UK) variant
The results of the #Flash 8 survey dated April 27, 2021, confirm the predominance of the variant of concern 20I/501Y.V1, which accounted for more than 80% of interpretable results across all age groups.
In France, as of May 18, 38 clusters involving at least one case of the variant of concern from the B.1.617 lineage, first detected in India, have been reported. Outbreaks have been identified in 9 different regions (7 in mainland France, Guadeloupe, and Réunion). To date, no evidence of significant community spread has been reported in France. The situation continues to be closely monitored.
Vaccination is gaining momentum
In one week (May 12–18, 2021), nearly 2.6 million people received their first vaccine dose, an average of 369,000 people per day. During this week, 3.46 million doses were administered (as first or second doses), an average of 494,000 doses per day.
As of May 18, 2021:
21,133,653 people who had received at least one dose of the vaccine and 9,866,934 who had completed the full vaccination series, representing 31.5% and 14.7% of the population, respectively.
The estimated vaccination coverage among the adult population (aged 18 and older) was 40.1% for at least one dose and 18.7% for full vaccination.
For people aged 75–79, vaccination coverage for at least one dose is 84.1% (fully vaccinated: 67.7%)
74.3% for those aged 80 and older (fully vaccinated: 60.3%).
Adherence to individual preventive measures and the rapid progress of vaccination remain essential as restrictions are eased, to continue reducing the number of severe cases of COVID-19 and new infections. In addition, anyone experiencing symptoms suggestive of COVID-19 should immediately self-isolate and get tested as soon as possible. Finally, it is important to encourage vaccination among priority groups who have not yet been vaccinated. The use of digital tools (TousAntiCovid) is recommended to strengthen contact tracing and rapid isolation measures.
More Accurate Metrics for Tracking Confirmed Cases
The SI-DEP information system enables real-time tracking across the entire country of the total number of COVID-19 cases, the incidence rate, the positivity rate, and the testing rate. This system continuously adapts and incorporates all developments related to testing (antigen tests, saliva tests, and screening tests for suspected variants). To ensure the protection of the personal data of those tested, an algorithm links each test result to the generation of an anonymized pseudonym. This algorithm has recently been updated so that it counts only a single patient when that individual is tested multiple times within a short period, as can sometimes occur with enhanced monitoring of variants. The indicators have been recalculated for the entire country, which has allowed for the elimination of duplicates. The difference between the indicators calculated using the new and old methods is 12% for the incidence rate and 8% for the positivity rate. This difference does not alter the assessment of the epidemic’s dynamics; these changes enable the SI-DEP system to produce more accurate data and enhance its effectiveness.
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