Quite possible. OTOH they might just be testing more. Since the test produces mostly false positives, depending on the cycles of course, the amount of testing should be the primary determinant of Covid positive test results.I haven't come across any info that explicitly outlines a change in the Ct guidelines for Ontario, Canada. You are correct.
This is very concerning given the significant correlation between increased mass vaccination and significantly increased cases (even more so than they are already artificially inflated) especially given the time period and fact that coronaviruses do not peak in the spring/summer, the peak period would be between Jan-March according to: Seasonality of coronaviruses and other respiratory viruses in Canada: Implications for COVID-19, CCDR 47(3) - Canada.ca
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The fact that. as you mentioned, no changes have been made to either diagnostic testing method or lockdown/masking/distancing (still as strict as they have been all year), suggests that another variable would have to be responsible, at least to some extent, to the significant increase in cases. The only new large scale pandemic management strategy that has changed is mass roll out of the experimental gene therapy. This would seem incredibly plausible given the studies for it showing that at best they offer only a 0.7-1.1% risk reduction (while having no data on medium-long term effects), which is likely much less in older individuals and those with multiple comorbidities.