Disease Reporting

Public Health relies on medical providers, school officials, and the public to notify us when they encounter cases or suspected cases of certain diseases or conditions.

Public Health Nurses (PHN) investigate reported diseases and, as appropriate, involve epidemiologists, environmental health specialists, public health laboratories, or the health officer in their investigations. The state of California requires the following to report cases or suspected cases of certain diseases and conditions to the local health department:

  • Doctors
  • Surgeons
  • Nurses
  • Practitioners
  • Coroners
  • Dentists
  • Veterinarians
  • Administrators of health facilities and clinics

Anyone in charge of public or private schools or preschools also must report cases or suspected cases of these diseases.

Download Forms

The Confidential Morbidity Report (CMR) forms listed below are used to report most reportable diseases and conditions. Some PDF files may require download before they can be opened.

  • To report all conditions except those listed in the following sections:
  • To report Tuberculosis (TB):
  • To report conditions which may impair the ability to operate a motor vehicle, such as lapses of consciousness or control, Alzheimer's disease:
  • To report HIV/AIDS:
    • See HIV/AIDS Reporting on this page for more information

Submit reports to:
Health Officer
County of Lake
Department of Health Services
922 Bevins Court
Lakeport, CA 95453
Phone: 707-263-1090
Fax: 707-262-4280

Reportable Diseases & Conditions

The following describes the reporting requirements for communicable diseases and is displayed here for your convenience, last updated July 27, 2022. This data was sourced from California Department of Health (CDPH), form CDPH110a (PDF). For the latest information, please visit CDPH.

Per Title 17, California Code of Regulations (CCR) §2500, §2593, §2641.5-2643.20, and §2800-2812

§2500. Reporting to the Local Health Authority

§2500 (b) It shall be the duty of every health care provider, knowing of or in attendance on a case or suspected case of any of the diseases or conditions listed, to report to the local health officer for the jurisdiction where the patient resides. Where no health care provider is in attendance, any individual having knowledge of a person who is suspected to be suffering from one of the diseases or conditions listed may make such a report to the local health officer for the jurisdiction where the patient resides.

§2500 (c) The administrator of each health facility, clinic or other setting where more than one health care provider may know of a case, a suspected case or an outbreak of disease within the facility shall establish and be responsible for administrative procedures to assure that reports are made to the local health officer.

§2500 (a)(14) 'Health care provider' means a physician and surgeon, a veterinarian, a podiatrist, a nurse practitioner, a physician assistant, a registered nurse, a nurse midwife, a school nurse, an infection control practitioner, a medical examiner, a coroner, or a dentist.

Useful Links

Urgency Reporting Requirements [17 CCR §2500(h)(i)]

Reporting expectations are listed in calendar days unless otherwise mentioned.

Reportable Diseases and Conditions Chart

Unusual Conditions That Require Clinician Reporting

County of Lake Health Services depends on clinicians to identify and report infectious diseases. Clinicians may be the first to see a potential outbreak and their prompt notification to public health officials enables us to investigate and begin disease control activities as soon as possible. For some diseases every hour makes a difference in preventing illness and death.

In addition, we ask that clinicians immediately (within one hour) report unusual occurrences or patterns of disease, such as:

  • Serious, unexpected, unexplained acute illness with atypical host characteristics
    • Examples: severe illness in a young patient without immunologic defects, underlying illness, recent travel or other exposure to a potential source of infection
  • Multiple similarly presenting cases, especially if these are geographically associated or closely clustered in time
    • Example: persons who attended the same public event or gathering or who work in the same building
  • An increase in a common syndrome occurring out of season
    • Example: many cases of influenza-like illness in summer
  • An unusual age distribution for common diseases
    • Example: many cases of chickenpox-like illness among adult patients who would be expected to be immune to varicella

Influenza Reporting

Novel or Variant Influenza

Report suspected cases of novel or variant influenza immediately to Communicable Disease Control at 707-263-1090. After hours, weekends and holidays, please use ext. 9 to be connected to an on-call duty officer.

Novel influenza ("bird flu" e.g., A/H5N1 and A/H7N9 viruses) is characterized by influenza-like illness severe enough to require inpatient medical care in a person with recent (within 10 days of illness onset): (a) close contact with a confirmed or suspected case of human infection with a novel influenza virus; OR (b) travel to areas where a novel virus has been detected in humans or animals; OR (c) working with a novel influenza virus in a lab.

Variant influenza ("swine flu") is caused by an influenza A virus that normally circulates in pigs and can occur sporadically in humans, most commonly among people who have direct or frequent contact with pigs.

For additional information, forms, and references please contact Communicable Disease 707-263-1090.

HIV Reporting

§2641.30-2643.20 - Human Immunodeficiency Virus (HIV) infection at all stages is reportable by traceable mail, person-to-person transfer, or electronically within seven calendar days. For complete HIV-specific reporting requirements, see Title 17, CCR, §2641.30-2643.20 and the California Department of Public Health's HIV Surveillance and Case Reporting Resource page.

  • Reportable Noncommunicable Diseases and Conditions §2800-2812 and §2593(b)
  • Disorders Characterized by Lapses of Consciousness (§2800-2812)
  • Pesticide-related illness or injury (known or suspected cases) (See Footnote #2)
  • Cancer, including benign and borderline brain tumors (except (1) basal and squamous skin cancer unless occurring on genitalia, and (2) carcinoma in-situ and CIN III of the Cervix) (§2593) (See Footnote #3)


  1. Form CDPH 110a is designed for health care providers to report those diseases mandated by Title 17, California Code of Regulations (CCR). Failure to report is a misdemeanor (Health and Safety Code §120295) and is a citable offense under the Medical Board of California Citation and Fine Program (Title 16, CCR, §1364.10 and 1364.11)
  2. Failure to report is a citable offense and subject to civil penalty ($250) (Health and Safety Code §105200)
  3. The Confidential Physician Cancer Reporting Form may also be used. See Physician Reporting Requirements for Cancer Reporting in CA