Number of reported cases of RSV, COVID-19 and flu during week 45 of 2025;
Credit: MSAN
On Thursday 13 November 2025, the Health Directorate of Luxembourg's Ministry of Health and Social Security published its weekly overview on the development of major acute respiratory infections, including COVID-19, influenza (flu) and respiratory syncytial virus (RSV), for the week of Monday 3 to Sunday 9 November 2025 (week 45).
Decrease in COVID-19 / SARS-CoV-2 cases
During week 45, the number of positive COVID-19 cases decreased from 97 to 64 cases, a 29% drop compared to the previous week. The viral concentration detected in wastewater also declined. The latest available sequencing data reveal that the XFG variant (56.0%) and its subvariant XFG.3 (29.8%) remained predominant.
Slight increase in flu cases, with numbers remaining low
The number of flu cases reported by laboratories rose slightly, from 25 to 39 cases, over one week. Influenza A accounted for 95% of the typed results and influenza B for 5%.
Low number of RSV cases
The number of RSV cases reported by laboratories saw a slight increase, with 38 compared to 35 the previous week, while remaining at a low level.
EO
