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Department of Health Services

Public Health Disease Control

Diseases and Conditions


Ebola Virus

Ebola is a rare and deadly disease caused by infection with one of the Ebola virus species. Ebola can cause disease in humans and nonhuman primates.



List of testing locations and treatment providers for HIV/AIDS in Sonoma County.


Hepatitis A

Resources for community members and healthcare providers about Hepatitis A.


Hepatitis C

Resources for community members and health providers about Hepatitis C, an infectious virus that predominantly attacks the liver.


Influenza (Flu)

Influenza is a serious disease that can lead to hospitalization and sometimes even death. Every flu season is different, and influenza infection can affect people differently.


Lyme Disease

Lyme disease is caused by the bacterium Borrelia burgdorferi and is transmitted to humans through the bite of infected blacklegged ticks. Most cases of Lyme disease can be treated successfully with a few weeks of antibiotics. Steps to prevent Lyme disease include using insect repellent, removing ticks promptly, and reducing tick habitat.


Monkeypox (MPX)

Monkeypox is a rare disease caused by infection with the monkeypox virus. Monkeypox virus is part of the same family of viruses as smallpox.



Norovirus is a highly contagious virus. Norovirus illness is often called by other names, such as food poisoning or the stomach flu. It causes gastroenteritis (inflammation of the stomach and intestines), which leads to diarrhea, vomiting, and stomach pain.


Pertussis (Whooping Cough)

Pertussis is a highly contagious bacterial disease that can be spread by coughing. People with pertussis have severe coughing attacks that can last for months. Infants too young for vaccination are at greatest risk for life-threatening cases of pertussis.


Sexually Transmitted Diseases (STDs)

Information on STD testing and various STD fact sheets.



Information about Shigellosis, an infectious disease caused by a group of bacteria which causes diarrhea, fever, and stomach cramps.



Syphilis is a sexually transmitted infection that can cause serious health problems if it is not treated.


West Nile Virus

West Nile virus (WNV) is an infection of birds that is transmitted by mosquitoes. Occasionally, humans and other animals are infected when bitten by an infected mosquito. WNV tends to be seasonal, beginning in the early summer and continuing through fall.


Zika Virus

Zika virus disease is often so mild people don’t know they have it. However, Zika infection during pregnancy can cause birth defects. Also there have been increased reports of an uncommon sickness of the nervous system in areas affected by Zika.