World’s most contagious disease continues to spread in California as more clusters form
California health officials are responding to a growing measles outbreak after two additional infections were confirmed Monday in Sacramento County. The new cases raise the statewide total to 34.
Authorities said the most recent infections involve children who had not been vaccinated. According to public health officials, measles rarely causes problems for people who have received the vaccine, but it can present serious health risks for those who have not.
Dr. Olivia Kasirye, Sacramento County’s public health officer, said the discovery of additional cases shows how rapidly measles can move through a community. She emphasized that the illness can lead to severe complications but noted that vaccination can prevent these infections. Kasirye urged residents to consider vaccination as the most effective way to protect both themselves and others.
While officials said the overall danger to the public is still considered low, they are encouraging residents to remain alert and take precautions to reduce the chances of further spread.
Measles is widely regarded as the most contagious infectious disease in the world. Most children receive the measles, mumps, and rubella (MMR) vaccine, which health authorities say provides long-term protection against the virus. The Centers for Disease Control and Prevention reports that symptoms typically appear between seven and fourteen days after exposure and can include a high fever, runny nose, coughing, and a distinctive rash.
Across the United States, measles cases have been identified in 33 states. Health officials say about 92 percent of infections involve people who are either unvaccinated or whose vaccination history is unknown. In 2026, the country has recorded more than 1,671 confirmed cases.
The two children recently diagnosed in Sacramento County are currently isolated and recovering, according to local health officials. Public health leaders in Los Angeles County also raised concerns last month about the disease spreading further.
Dr. Sharon Balter, who oversees acute communicable disease control for Los Angeles County Public Health, told Cal Matters that measles spreads extremely easily. She said outbreaks can expand rapidly, making it essential for health officials to respond immediately rather than delaying action.
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