Note: “Probable” cases include close contacts of a confirmed case who become symptomatic, positive antigen test, or positive serology/antibody test AND a credible history of COVID-like illness. For full definition of a "Probable" case, please see the Department of Health guidance.
** Based on what is reported to the Health District daily, and a weekly reconciliation with state Department of Health data.
To better align with the Washington State Department of Health’s data dashboard, the Snohomish Health District has incorporated positive antigen results into case reporting.
Effective April 19, the weekly case count update now includes a bar chart with total positive cases for the week broken into molecular and antigen cases. The rolling 2-week case rate has also been updated to incorporate antigen cases going back in time. This recalibration has resulted in a slight increase in rolling 2-week case rates.
Antigen test results are still positive cases, but conducted through rapid tests rather than molecular testing doing at laboratories. This addition of antigen-positive cases is not what’s driving the observed increase in the rolling 2-week COVID rate. The overall increase in case rates is due to increased transmission. Only 18% of confirmed cases over the past month are antigen-positive cases.