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...

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... Links in this section relate to Body

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...

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...

Body A case of measles has been confirmed in a pediatric patient residing in Orange County who recently returned from international travel. This is the 5th case of confirmed measles...

Body Key Messages: Multiple detections of West Nile Virus (WNV)-positive mosquitoes in Orange County and a much higher-than-usual number of human WNV cases in California to date signal...

Body A case of measles has been confirmed in a pediatric patient residing in Orange County. The case was infectious while they traveled arriving at LAX 7/16/2026 after living abroad...

Body Centers for Disease Control and Prevention (CDC) released a Health Advisory to raise awareness of cyclosporiasis due to a large increase in domestically acquired disease in...

Body There has been an increase in travel-related introductions of clade I mpox into California and the U.S. in 2026, and clade II mpox cases have increased in California. Increases in...