Communicable Disease Reporting

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Report a Disease

  During Business Hours
Monday - Friday 8:00 a.m. - 5:00 p.m.
(Excludes Weekends & Holidays)

  • To report a COVID-19lab confirmed positive test please:  
    • Call (530) 666-8614, for all non-vulnerable populations. 
    • Call (530) 321-3620, to report lab confirmed positives for these vulnerable populations:  pregnant woman, children under 5 years of age, and high risk congregate settings (i.e. long-term care, skilled nursing facilities, jails, or shelters) or deaths. DO NOT leave test information about vulnerable populations on the Provider Line. 

  • To report any other URGENT communicable disease concern during business hours, call: (530) 666-8670

After calling to report, download and complete the Confidential Morbidity Report (CMR), forms are specific to the type of disease reported. The second page of the CMR lists all reportable disease and guidelines for reporting. Fax completed forms to our Confidential Fax: (530) 669-1549.

HIV/AIDS reporting guidelines are posted here or you may call the Yolo County HIV/AIDS Program Coordinator at (530) 666-8670 to report.  Please do NOT fax HIV/AIDS reports.

During Non-Business Hours
after 5:00 p.m. on Weekday, or any time on weekends and holidays

To report a COVID-19 lab confirmed positive test  or an URGENT communicable disease concern outside of business hours call:

(530) 321-3620

 Please be prepared to provide the dispatcher with your name, affiliation, the nature of the report or emergency and a phone number where you can be contacted by the Yolo County Community Health Branch on-call staff.


Yolo County Health and Human Services Agency
 Communicable Disease Program
  25 N. Cottonwood Street
Woodland, CA 95695

Business Hours: Monday through Friday 8:00 am to 5:00 pm
Community/Public Health Main Line
(530) 666-8643
Confidential Fax (530) 669-1549

After Business Hours (24/7), contact the MHOAC at (530) 321-3620

Yolo County Press Releases             Health Alerts (CAHAN)

List of Reportable Diseases


Expand/Contract Questions and Answers

  • Don't labs report all these disease anyway?

  • How does the Health Insurance Portability and Accountability Act (HIPAA) affect disease reporting?

  • How quickly must disease be reported?

  • Is someone available to answer communicable disease questions?

  • Should I wait for lab confirmation before reporting a disease?

  • What diseases have been reported in Yolo County in the past?

  • What diseases must be reported?

  • What is the legal basis for disease reporting in California?

  • Where can I find more information about specific diseases?

  • Where is testing for blood-lead levels available? How much does testing cost?

  • Who must report diseases?

  • Who should get a blood-lead test?

  • Why must health care providers report?