Comparison of longitudinal trends in self-reported symptoms and COVID-19 case activity in Ontario, Canada.
Arjuna S MaharajJennifer B ParkerJessica P HopkinsEffie GournisIsaac I BogochBenjamin RaderChristina M AstleyNoah M IversJared B HawkinsLiza LeeAshleigh R TuiteDavid N FismanJohn S BrownsteinLauren Lapointe-ShawPublished in: PloS one (2022)
Although digital surveillance systems are low-cost tools that have been useful to signal the onset of viral outbreaks, in this longitudinal comparison of self-reported COVID-like illness to Ontario COVID-19 case data we did not find this to be the case. Seasonal respiratory virus transmission and population coverage may explain this discrepancy.