Body Summer is here and with that comes mosquito season. Did you know that mosquitoes are responsible for more human deaths than any other animal in the world? There is a long list of diseases spread by the bites of mosquitoes. In Orange County, the most common disease spread by mosquito... Links in this section relate to Body

Body (Santa Ana, CA) – The OC Health Care Agency (HCA) received confirmation of a measles case in a toddler who had history of international travel. The HCA is notifying individuals who were exposed to the person in healthcare and other settings. “Measles is highly contagious. Anyone planning domestic or international...

Body (Santa Ana, CA) - A resident of Anaheim has tested positive for West Nile virus (WNV) infection, becoming the first human WNV infection in Orange County this year. Since there are no vaccines to prevent or medicines to treat WNV, health officials urge residents to take precautions. “West Nile virus...

Body (Santa Ana, CA) - June 27 marks National HIV Testing Day (NHTD), which promotes testing and early diagnosis of HIV (human immunodeficiency virus). This year’s NHTD theme is Level up your self-love: check your status. Now is the time to take an HIV test. Knowing your status is the first...

Body (Santa Ana, CA) - The OC Health Care Agency (HCA) has extended recruitment for the CalOptima Health Board of Directors. As a County-Organized Health System, CalOptima Health serves over 829,000 low-income children, adults, seniors and people with disabilities. CalOptima Health launched in 1995 in response to the local health care...

Body A resident of Anaheim has tested positive for West Nile Virus (WNV), becoming the first human WNV infection in Orange County this year. In 2025, Orange County had three WNV human infections. As of July 31st, the California Department of Public Health reported 11 human infections of West Nile Virus...

Body Key Messages California Department of Public Health (CDPH) urges clinicians and local health departments to remain vigilant for acute flaccid myelitis (AFM), which presents as sudden limb weakness usually in children and can lead to permanent paralysis. Increased summer travel and gatherings may elevate circulation of respiratory pathogens, including enterovirus...

Body The Centers for Disease Control and Prevention (CDC) is issuing this Health Alert Network (HAN) Health Advisory to share information and notify clinicians, public health authorities, and the public about the risk of severe arboviral neuroinvasive disease among patients who are receiving B cell-depleting or B cell-modulating medications, particularly anti-CD20... Links in this section relate to Body

Body A case of measles has been confirmed in an adult resident of Orange County. This person is a contact to a known case. This is the 6th case of confirmed measles reported in an OC resident in 2026. In 2025 2 cases of measles were reported. Key Message If measles...

Body (Santa Ana, CA) – The OC Health Care Agency (HCA) received confirmation of a measles case in an adult which was locally acquired from a known exposure. The individual visited several public locations during the infectious period including the following: 8/11/26 – 5 p.m. - 10 p.m. – Anaheim Packing...