HeyJaredYour Local Epidemiologist in California
Translating the ever-changing science of public health for Californians so you can take action for your community’s health
- Indexed issues, last 90 days
- 12
- Latest publication
- Sep 24, 2026
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- Jul 16, 2026
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A Super El Niño is headed for California (opens the original)
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I'm at Climate Week in New York, soaking up what I can from the world’s climate experts, to bring home to California. Climate change is the biggest long-term threat to our health, and many of you have asked me to cover it more. Right now, El Niño is top of mind. Here’s a 4 minute video to guide your understanding and help you prepare. Below is the transcript, for those who prefer to read.Hello everyone, I’m Matt Willis, your local epidemiologist in California. I’m in New York, at Climate Week, w
An emerging opioid threat, mRNA flu vaccine, Covid-19 rising, and a poll (opens the original)
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Our progress against opioid harms is being challenged by emerging synthetic agents, Covid-19 is still surging, and we have a new tool to fight flu. And I could use your help prioritizing among climate health concerns. Let’s jump in.An emerging opioid threat in CaliforniaIn April, a 16-year-old died in his bedroom in San Francisco from a drug his mother had never heard of. The medical examiner found cychlorphine, a newly circulating synthetic opioid roughly ten times
Supporting men and boys, curing Hepatitis C, and Covid still surging (opens the original)
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Today’s edition covers a lot of ground. Last Monday was the deadline for bills to pass the Legislature and make their way to the governor for his signature or veto. I’ve been keeping an eye on a few bills that matter to our health, and here’s where they stand.Following the data to prevent suicidesLast week, Governor Newsom signed a law authorizing the state’s Office of Suicide Pre
Fall vaccines, and a life-saving policy (opens the original)
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This week is all about vaccines: what California got right a decade ago, and what’s new for this year’s shots.Closing a dangerous loophole for school-required vaccinesA baby died of measles in Pennsylvania last week. So did an unvaccinated adult. They were the first measles deaths in the U.S. this year. Nationally,<
Tackling asthma in schools, Covid-19, and West Nile virus (opens the original)
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It’s been a hot late-summer week, and we’re shifting away from summer routines. In our house, were getting back into the rhythms of high school. Today’s Dose focuses on a huge initiative to get asthma meds to kids who need it, and the ongoing surges in Covid-19 and West Nile. We’ll start with asthma. Breathing room: Inhalers for every schoolLast week, Governor Newsom announced that the state will supply free emergency albuterol inhalers to every public and charter school in California. That’s ov
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