California disease surge amid seasonal shifts

California is experiencing shifting patterns in disease outbreaks, with COVID-19 moving from winter to summer seasonality and concerns rising about vector-borne diseases from mosquitoes, ticks, and fleas. Health officials are adjusting prevention strategies as wastewater data shows increased COVID-19 levels across multiple Bay Area communities.

This is a long-running storyline that has developed over 8 days. The homepage highlights its most recent activity, so the outlet count there reflects the latest wave. The totals above cover the full run.