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Division of Communicable Disease Control

Mpox

Health Advisories and Updates

  • 10/17/2025: Community Spread of Clade I Mpox Within California​—Reports on three new cases of clade I mpox that indicate community transmission. This advisory includes recommendations for commercial laboratory specimen handling, local reporting, and emphasizes the importance of vaccination, health care infection control, and home isolation for patients while mpox testing results are pending.
  • 8/26/2025: Recent Rise of Mpox Cases in California and the Area—This health advisory reports on an increase of clade II mpox cases with an overview of current recommendations and resources for mpox clinical recognition, testing, treatment, and vaccination.​
  • 11/19/2024: ​First Clade I Mpox Case Confirmed in California and the United States in a Returning Traveler – This health advisory reports on the first case of clade I mpox in California. It summarizes California-specific recommendations for how to obtain expedited clade-specific mpox testing for symptomatic patients with recent international travel history.

Health Care Providers

Topics: Clinical Recognition and Considerations | Provider Vaccine Information | ​ Mpox Treatment​ |​ Provider Reporting | Infection Prevention and Waste Management in Healthcare Settings

Clinical Recognition and Considerations

Provider Vaccine Information​

Mpox Treatment

Infection Prevention and Waste Management in Healthcare Setting

Laboratories

As a reminder, mpox testing is available at many commercial laboratories and providers should consult their laboratory for submission criteria. Providers may otherwise contact their local health department to inquire about testing throu​gh the public health lab if needed, including for clade-specific testing.​​​​​​

Local Health Departments​

Topics: Case Reporting | Case Investigation and Other Setting-Specific Guidance​ |​ LHJ Vaccine Information | Messaging and Communications Toolkit​

Case Reporting

  • Suspected Clade I Mpox Case: Notify CDPH STDCB and CDPH VRDL immediately of any cases with suspected clade I mpox. At this time, all specimens collected from a case with suspected clade I mpox should be sent to your local public health lab and forwarded to CDPH VRDL if the local public health lab does not have clade I testing capabilities.
  • Mpox Case Definition – CDC guidance for surveillance case definitions and criteria, including for reinfections.
    • Interim reinfection reporting to CDPH:
      • Create new incident ID for suspected reinfection cases and attach ELR.
      • ​Assess for case criteria per CDC definition (i.e., symptom resolution between episodes) and note “reinfection” within notes tab along with primary infection incident ID.
      • ​If possible, forward any specimens that may meet reinfection criteria to VRDL for WGS.
      • Send secure email to stdcb@cdph.ca.gov
  • Death reporting – See CDC MMWR on mpox-associated deaths. For public health surveillance in CalREDIE, use the death certificate (i.e., if mpox is listed on the death certificate as a primary or significant contributing factor) for determining mpox associated death.
    • ​​​See CalREDIE document repository or LHJ SharePoint for further reporting information—email mpoxadmin@cdph.ca.gov​ to request SharePoint access.

Case Investigation and Other Setting-Specific Guidance

LHJ Vaccine Information​

  • CDPH Mpox Vaccination – CDPH information about mpox vaccine and how to find a vaccinating provider.
  • EZIZ: Mpox Vaccination Resources – CDPH Immunization Branch website with up-to-date information for clinics and local health departments regarding JYNNEOS administration, vaccine ordering, and other resources.
  • Mpox Vaccination – CDC JYNNEOS vaccine recommendations.
  • Note: A limited supply of CDPH-purchased JYNNEOS may be available for LHJ use in outbreaks and/or for certain priority populations (e.g., uninsured, underinsured or with other barriers to care). Email STDCB@cdph.ca.gov​  to request and check availability.

Messaging and Communications Toolkits

  • CDPH LGBTQ+ Health: Pride Toolkit – CDPH webpage with educational materials (posters, flyers, and sticker files) about mpox and sexual health available in English and Spanish.
  • Sexual Health​ Campaigns Toolkit – CDPH STD Control Branch webpage with mpox fact sheets, videos, and graphics for community-based organizations and local health departments.
  • Resources for Event Organizers and Venues:

Community Guidance

Topics: How to Prevent Mpox | If You Have Mpox​ | ​Mpox Q&A

How to Prevent Mpox

If You Have Mpox

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How Can We Help You?

Connect with CDPH for additional mpox resources.

Contact CDPH STD Control Branch Mpox Team

If you need further clarification or have questions, comments, and concerns regarding CDPH Mpox, submit an inquiry​.

Contact Your Local Public Health Department

Reach out to your local health department with any questions.​


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