County of Marin Health and Human Services

Public Health Provider Newsletter - August 2025

Public Health Provider Newsletter - August 2025
Marin County Public Health Newsletter - August 2025
In this Issue: Maintaining Vaccine Confidence | mRNA Vaccine Safety & Research Funding | Hepatitis B Birth Dose | Valley Fever | Clinical Perspective: Understanding Mifepristone's Safety & the Importance of Informed Access | Message from the Public Health Officer 
A message to physicians and other healthcare providers from Marin County's Public Health Officers.

Maintaining Vaccine Confidence: The Role of Local Healthcare Providers

Infant receiving a vaccine This month is National Immunization Awareness Month. The national spotlight has returned to vaccine safety with the relaunch of the federal Task Force on Safer Childhood Vaccines, led by NIH Director Jay Bhattacharya. It’s the first time in 25 years such a panel has been convened, and it comes at a time of wavering confidence in public institutions and in science itself. The CDC’s authority is being reduced, reflecting a broader shift in federal priorities regarding data, scientific standards, and evidence-based practices. At the same time, social media is amplifying vaccine-related misinformation, contributing to public confusion and a decline in trust in health guidance. Your impact starts here. Patients rely on you for clarity. By addressing concerns directly and connecting families to trusted resources such as Let's Get Real about Vaccines and Johns Hopkins Institute for Vaccine Safety, you build trust and strengthen vaccine confidence. Vaccination embodies the values we uphold as healthcare providers—family, community, and personal responsibility—protecting not only each patient but also our children, older parents, and immunocompromised neighbors.


mRNA Vaccine Safety and Research Funding


Last week, Marin County Public Health released a Public Health Advisory to support providers in communicating the current evidence and context around mRNA vaccines. mRNA vaccines remain among the most closely studied vaccines ever developed, with extensive data confirming strong safety and effectiveness. The recent HHS decision to discontinue funding for ongoing mRNA vaccine research carries significant implications. Without federal investment, opportunities to deepen long-term safety monitoring, explore next-generation platforms, and build public trust are limited. For providers, this shift underscores the importance of communicating what is already known: mRNA vaccines have a robust safety record, and ongoing surveillance continues through existing national systems. Your clear, evidence-based guidance is critical to sustaining overall vaccine confidence in this new environment.

Hepatitis B Birth Dose: A Critical Step in Preventing Chronic Infection

Healthcare providers play a crucial role in preventing lifelong hepatitis B virus (HBV) infection by providing timely vaccinations and educating families. HBV is 100 times more infectious than HIV, and perinatal infection carries up to a 90% risk of chronic disease, often progressing silently to cirrhosis or liver cancer. Before universal infant vaccination began in the early 1990s, over 18,000 U.S. children under age 10 were infected annually; routine immunization—beginning with a birth dose—has since reduced pediatric HBV cases by 95%.

Mother holding infantAdministering the first dose of the HBV vaccine within 24 hours of birth is essential, even if maternal screening is negative. It initiates early immunologic priming and immune memory, offering long-term protection. With its strong safety record, the hepatitis B vaccine is a trusted, life-saving intervention providers can confidently recommend.


Valley Fever: Don't Miss the Diagnosis

Although Valley fever is uncommon in Marin County, it may be under-recognized and under-tested. Consider this diagnosis in patients with respiratory or systemic symptoms lasting more than 7–10 days (e.g., cough, fever, night sweats, dyspnea, chest pain, fatigue). Take a detailed exposure history, including:

  • Recent residence, work, school, or travel in endemic regions (Central/Southern California, the Southwest).
  • Activities with soil or dust exposure (digging, construction, off-road recreation, agriculture).
  • Outdoor occupations, especially construction, agriculture, and wildland firefighting—risk increases during fire season when soil disruption is common.

Early recognition and testing support timely management and patient education.  Learn more from the California Department of Public Health (CDPH): Valley Fever (Coccidioidomycosis).


Clinical Perspective: Understanding Mifepristone's Safety and the Importance of Informed Access

Mifepristone has been an FDA-approved component of early abortion care and miscarriage management for over two decades. Its safety and efficacy are well established, with serious adverse events remaining rare when used as directed. Major medical organizations, including ACOG and the AMA, continue to support its use based on a robust body of clinical evidence. Ideological groups seeking to restrict abortion access have promoted inflated complication rates based on unverified, non-peer-reviewed data. These claims lack clinical context and aim to undermine trust in safe, evidence-based reproductive care. As providers, it’s critical to assess such claims through the lens of evidence-based practice and uphold standards of scientific rigor. Ensuring continued access to mifepristone protects patient autonomy and reproductive health.


Message from the Health Officer

Driving through Los Angeles this month brought back memories of the devastating 2025 Palisades Fires—12 lives lost, more than 100,000 people evacuated, and thousands of homes destroyed or damaged. Passing fire-scarred areas along I-5 near Grapevine, where first responders remained on watch, was a powerful reminder of both our vulnerability and their courage.

That reality came close to home last week when I was called to respond to the Canal Fire and help shelter families who had lost everything. The City of San Rafael demonstrated outstanding, unwavering leadership, while Canal Alliance immediately stepped forward as the trusted community partner. Alongside county staff and the Red Cross, we moved quickly to provide emergency shelter and begin the long road to recovery. Please consider supporting this effort by donating to the Canal Alliance Client Support Fund.  

Looking ahead, on September 6th Fire Safe Marin will host Ember Stomp, our county’s annual wildfire prevention festival, in conjunction with the countywide evacuation drill. Please help spread the word to your patients and teams—every step we take to prepare makes our community stronger. Learn more at https://firesafemarin.org/.

Stay safe, strong, and kind,
Lisa M. Santora, MD, MPH
HealthOfficer@marincounty.gov
Ember Stomp Sept 6, 2025
This newsletter was reviewed for language and readability using AI-assisted editing tools.

 
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Marin County Public Health, a division of the Marin County Health & Human Services Department
https://www.marinhhs.org/public-health

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