I'm guessing a fair bit here so if I'm wrong, please excuse me. I think 'sequencing' is done to detect a variant after a PCR test. The PCR test doesn't detect the variant.(?) From gov of Canada website influenza tracker: 'Nationally, the 2019-2020 influenza season in Canada began on week 47 (November 17 to 23, 2019), peaked in late January (week 5) and ended early and abruptly on week 13 (March 22 to 28, 2020), eight weeks earlier than the average end of season.' a bit further down the same page: 'During the active influenza season (mid-November to mid-March), all seasonal influenza types and subtypes (A(H1N1), A(H3N2) and B/Victoria) circulated concurrently, resulting in higher than average numbers of influenza detections and hospitalizations being reported during that time period.' I have yet to hear/read a good explanation of why a higher than average flu season stopped abruptly when covid started getting press coverage in Canada. I believe that the PCR does not differentiate between influenza, colds and covid-19.