\u0027 ... even though most public health mandates have been lifted, transmission rates are now fairly low,\u0027 says toxicologist Dr. John Giesy
Tests of the sewage in Saskatoon in the week to June 15 showed the viral RNA load had decreased by 56.3 per cent, the eight smallest load recorded since the beginning of the Omicron wave.
Viral RNA load in Prince Albert’s wastewater decreased by 26.2 per cent in the week to June 13, and was a second successive decrease in the city.” … decreases in the viral loads at all three cities and the loads of virus remain fairly low, but all are greater than the detection limit. This means that even though most public health mandates have been lifted, transmission rates are now fairly low,” University of Saskatchewan toxicologist Dr. John Giesy wrote in an email.
“At this point essentially all of the virus is the subvariant of BA-2 of Omicron. We are continuing to screen for BA-3, BA-4 and BA-5 by use of whole genome sequencing, which is semi-quantitative and as yet are not seeing these other variants, which have been appearing in other countries and some of the large metropolitan areas of Canada.”
Giesy is part of a U of S team measuring COVID-19 through wastewater. People infected with the virus contain traces of it in their feces. By measuring the viral load in a city’s sewage, researchers are able to approximate how many people in that city are infected with COVID-19, even if those people themselves do not know it.
Since Saskatchewan no longer reports daily COVID-19 data and relies on rapid antigen tests for testing in the general population, wastewater data is one of the best indicators available for how the virus is spreading.
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