California Respiratory Illnesses Have Risen

State health officials report increased cases of COVID-19, strep throat, and common colds this September.

Updated on Sept. 29, 2026 in Asthma

California Respiratory Illnesses Have Risen

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Respiratory illnesses have risen across California as the school year progresses. COVID-19 activity has reached its highest level since summer 2025 alongside increased reports of strep throat and common cold viruses.

Why it matters

The return of children to classrooms has significantly contributed to the spread of contagious infections across the state. Health officials are now monitoring a concurrent rise in respiratory ailments as schools remain fully in session.

COVID-19 and flu vaccines are currently available for all individuals over the age of 6 months. Additionally, RSV immunizations are available for pregnant women, infants, and older adults.

The players

California Department of Public Health

This is the state agency responsible for monitoring infectious disease outbreaks and issuing public health guidance to residents.

The details

Local health authorities are emphasizing the availability of preventive vaccinations to mitigate the impact of these seasonal illnesses. While current case numbers for COVID-19 have peaked relative to the past year, officials expect flu and RSV activity to climb further in the coming weeks.

September 2026: Respiratory illnesses are rising in California.
Summer 2025: Previous high point for COVID-19 case activity.

The Big Picture

This reporting follows the surveillance patterns established by the California Department of Public Health to manage seasonal viral surges. The current uptick mirrors historical trends seen when students return to school environments each autumn.

Residents should check their eligibility for flu, COVID-19, and RSV vaccines to protect against these rising seasonal infections. Maintaining updated immunization schedules is the primary recommendation for mitigating the risk of illness for both children and adults.

The takeaway

Maintaining personal hygiene and staying current on recommended vaccinations are essential steps to navigate the ongoing surge in respiratory viruses. Residents are encouraged to monitor local updates as flu and RSV activity is projected to increase through the autumn.