Your Local Epidemiologist in California

October heat wave • Who’s most at risk this week, and what to do about it

Early flu, Covid-19 peaks, and a record year for rabid bats • The CA Dose, October 2, 2026

A Super El Niño is headed for California • What to expect this winter, and how to prepare now

An emerging opioid threat, mRNA flu vaccine, Covid-19 rising, and a poll • The CA Dose, September 17, 2026

Supporting men and boys, curing Hepatitis C, and Covid still surging • The CA Dose, September 10, 2026

Fall vaccines, and a life-saving policy • The CA Dose, September 3, 2026

Tackling asthma in schools, Covid-19, and West Nile virus • The CA Dose, August 27, 2026

Covid-19 and West Nile surge, and California is protecting vaccine access • The CA Dose, August 13, 2026

One Year In • Looking back and forward at YLE CA

Your summer picnic bag • Bug spray, sunscreen, and protein

West Nile Virus, Covid-19, Cyclospora, and hot days ahead in California • The CA Dose, July 30, 2026

West Nile Virus is moving fast, the Covid-19 summer wave is real, and trust-building • The CA Dose, July 23, 2026

Covid is stirring again, and the diarrhea parasite is sparing California... so far • The CA Dose, July 16. 2026

Earth, wind and readiness: Preparing for poor air quality, and the Big One • The CA Dose July 2, 2026

Boyle Heights Fire: What's in the air, and who pays the price • A public health breakdown of the Lineage cold storage fire.

Rabies warning, protecting mental health treatment, measles, and a hot World Cup • The CA Dose, June 18, 2026

Debugging California: Fighting mosquitoes with mosquitoes • A deep dive on a potential public health game changer

Ebola, Hantavirus, and the Garden Grove chemical crisis • The CA Dose, May 28, 2026

Garden Grove chemical plant update • More progress, and some remaining questions

Garden Grove chemical plant situation • Top 9 questions

Shellfish poisoning, public benefits, and a hantavirus update • The CA Dose, May 14, 2026

Hantavirus Outbreak: California Update • Four residents are being monitored. Here's the full picture.

Passengers from hantavirus cruise ship in California • What it means for us, and measures being taken

Drug resistant infections in California • What's at stake and what we can do

Hepatitis C, and our threatened disease control systems • The CA Dose, April 23, 2026

Typhus in LA, and a life-saving net in San Francisco • The CA Dose, April 16, 2026

One • No newsletter this week. Just two images that speak for themselves.

A new Covid variant, rattlesnakes, social media, and public health standards • The CA Dose, April 2, 2026

Oral health crisis in the making, respiratory virus season's last act, botulism survivors • The CA Dose, March 26, 2026

Shingles, heat, federal vaccine changes, and RSV • The CA Dose, March 19, 2026

Pandemic anniversary reality check • Why we shut down the Bay Area six years ago-- and why revising that history puts us at risk

Pollen surges, RSV overstays, measles moves, and Dunnie • The CA Dose, March 12, 2026

Three outbreaks, eight viruses, and federal funding cuts • The CA Dose, March 5, 2026

Protect our public health pipeline: An ask • Public health is professional work. Tell the Department of Education before Monday at 9 PM.

The bottom line: Get screened for colon cancer • I'm headed for a colonoscopy. I've got my reasons.

Measles outbreak, record flu levels, new alcohol guidelines, and an invitation • The CA Dose, February 19, 2026

Cannabis and mental health, Super Bowl LX, flu B, and mushrooms • The CA Dose, February 12, 2026

TB outbreak in a school, measles in the Magic Kingdom, and flu • The CA Dose, February 5, 2026

Measles, Covid, and you • The CA Dose, January 29, 2026

Microplastics: Emerging science, personal choice, and policy in California

Floods, flu, and holding the line on vaccines • The CA Dose, January 8, 2026

Flu surges, we're not Denmark, and helping people with serious mental illness • The CA Dose, December 23, 2025

Public health dream team, gap in Covid protection, and holiday travel • The CA Dose, December 18, 2025

Deadly mushroom poisoning outbreak, Hepatitis B vaccine for babies, seasonal viruses, and botulism treatment • The CA Dose, December 11, 2025

Childhood vaccines threatened, ultraprocessed foods, Chagas disease, and winter viruses • The CA Dose: December 5, 2025

Flu has arrived • Plus "maternity care deserts", stone cutters' lung disease, and a botulism outbreak update

California at the center of an infant botulism outbreak • Plus teen mental health and social media, and our winter virus forecast.

Lessons from a puppy on vaccines • Shots mean freedom to play

Childhood flu deaths are rising: What you should know • Plus ICE in hospitals, CalFresh relief, seasonal virus report, and more.

Concerning mpox strain lands in California: Here’s what that means • Plus CalFresh delays, Halloween tips, and our respiratory virus update