Information to help improve and preserve the physical and emotional health of Orange County residents. Featured Services Medical Services Initiative Program (MSI) MSI contracts with private…

Carbapenem-resistant Enterobacteriaceae (CRE) are a family of germs that have high levels of resistance to antibiotics and therefore can be difficult to treat.  Examples of Enterobacteriaeceae…

Hepatitis B is a virus (HBV) that can cause inflammation of the liver. It is spread when blood, semen, or another bodily fluid from an infected person enters the body of someone who is not…

Hepatitis A is a virus that can cause inflammation of the liver. Symptoms of hepatitis A infection may include jaundice (yellow eyes or skin), abdominal pain, dark urine, pale (light-colored)…

Chikungunya is a virus transmitted to people by Aedes mosquitoes. There have been no locally acquired chikungunya in California, but cases have been reported in travelers to areas where…

What is mumps? Mumps is a contagious disease caused by the mumps virus. The most commonly known presentation is with pain and swelling around the parotid glands, which are along the jaw line…

Hepatitis C is a virus (HCV) that can cause inflammation of the liver. It is mainly spread from the blood from an infected person, for example, while sharing needles, or other equipment that has…

Rocky Mountain Spotted Fever (RMSF) is one of the deadliest tickborne diseases in the Americas. It caused by a bacteria, Rickettsia rickettsii, that is spread through the bite of an infected…

Shigella are bacteria (germs) that causes illness with diarrhea, fever and/or stomach cramps. There are four kinds (species) of Salmonella bacteria, causing approximately 500,000 illnesses each…

Salmonella is a bacteria (germ) that causes illness with diarrhea, fever and/or stomach cramps. There are many kinds of Salmonella bacteria, causing approximately 1.2 million illnesses, 23,000…