California Influenza Surveillance Data by Region and Season

Influenza surveillance data from California includes outpatient illness reports, clinical laboratory tests, and public health laboratory results. The California Department of Public Health collects and analyzes this information year-round to track activity, circulating viruses, and disease impact. Data is compiled weekly during the October-May influenza season.

Use Cases

• Analyze Influenza-like Illness trends by Region and Influenza Season from sentinel provider reports
• Compare the prevalence of Influenza Type, Influenza A Subtype, and Influenza B Lineage Type across different California regions
• Track co-circulation patterns of other respiratory viruses like RSV, Rhinovirus, and Coronavirus by Region and Season
• Assess laboratory surveillance data from clinical and public health sources to monitor virus detection changes

Strengths

• Data is collected year-round with weekly reporting during the core October-May influenza season
• Integrates multiple surveillance streams: outpatient illness, clinical labs, and public health laboratories
• Collaborative effort involving local health departments, laboratories, healthcare providers, and the CDC

Limitations

• The specific number of records, rows, or data points is not provided in the input
• Data granularity and column structure are unknown, limiting understanding of the available features
• Relies on voluntary reporting from sentinel providers and laboratories, which may introduce geographic or temporal reporting biases

Provenance

Source

Immunization Branch at the California Department of Public Health (CDPH)

Collection Method

Collected, compiled, and analyzed from volunteer sentinel providers, clinical sentinel laboratories, and California public health laboratories.

Time Range

Year-round collection with weekly reports from October through May.

Freshness

Last updated on 2025-11-23, indicating recent maintenance.

Geography

State of California, with data aggregated by region.