California, Percentage of visits for Influenza Like Illness, reported by Public Health Labs 2010-20.
Data from
https://gis.cdc.gov/grasp/fluview/fluportaldashboard.html
Notes:
- 2014 had a week 53! Eliminated that for this display.
- The 2019-20 season is bright red, marked with Xs rather than dots.
- There is no sign of anything unusual (such as acquisition of herd immunity for COVID-19).