In earlier days of the pandemic, looking at the number of COVID-19 cases in our community and whether it was rising or falling was a reliable indicator of risk. But that has changed. Case numbers are not as reliable now because a lot of people are testing positive with home tests and they are not always reported to public health.
COVID-19 breakthrough cases
Adapted from Public Health Insider – Official Insights from Public Health
Breakthrough cases aren’t limited to the SARS-CoV-2 coronavirus. Influenza vaccines reduce risk of illness by between only 40% and 60%.