Coronavirus in wastewater at persistently high levels
In Gothenburg's wastewater, the concentration of coronavirus continues to fluctuate at a relatively high level, the latest weekly survey from the University of Gothenburg shows. Simultaneously, a clear rise in enterovirus is evident.
The current measurements are based on samples taken during the week of March 21–27, and the results show a slight proportional decline in SARS-CoV-2 in Gothenburg’s wastewater.
“Given how many people have been infected and vaccinated, the amount of viruses ought to be declining now, but it’s continuing to fluctuate at a high level,” says Heléne Norder, adjunct professor at Sahlgrenska Academy, University of Gothenburg, and microbiologist at Sahlgrenska University Hospital.
As previous peaks
The coronavirus concentration is at or just above the peaks noted in the previous (first, second and third) waves of the pandemic. The current, fourth wave has been underway since mid-December.
SARS-CoV-2 monitoring of wastewater in Gothenburg has been conducted since February 2020. Norder and her research group report their findings to care providers and the Infection Control Unit in Region Västra Götaland.
A rising prevalence of coronavirus in wastewater indicates a growing incidence of COVID-19 in the community. On the other hand, the link between high wastewater concentrations and peak loads in healthcare has diminished as a type of SARS-CoV-2 omicron is the most prevalent variant that is spread and it produces milder disease than the previous variants.
Upturn for enterovirus
Besides SARS-CoV-2, the scientists also investigate concentrations of norovirus GG2 (the “winter vomiting bug”). According to the latest week’s measurements, this is now past its peak for the season. However, a distinct upturn in the concentration of enterovirus in the wastewater is evident.
“We definitely have an outbreak underway,” Norder stages.
Enterovirus can cause a broad spectrum of symptoms, from those of the common cold to inflammation of the pericardium, meningitis and paralysis. However, most people get only mild symptoms.