According to recent analysis by the Luxembourg Institute of Science and Technology (LIST), traces of the virus have appeared more frequently in the country's wastewater plants.

LIST analysed samples from thirteen different wastewater treatment plants, confirming a slight increase compared to last week.

Overall, the concentration of the virus in wastewater is comparable to the levels attained last December. 

The List report
 states that a general upward trend has been observed over the last few weeks and months.