First confirmed measles case reported in San Bernardino County since 2023

Unvaccinated minor visited Ontario Walmart during infectious period; public health urges vaccination and monitoring for symptoms

First confirmed measles case reported in San Bernardino County since 2023
(iStock Photo by Dr_Microbe)

SAN BERNARDINO COUNTY, Calif. — San Bernardino County health officials have confirmed a positive case of measles, the first reported in the county since 2023, involving an unvaccinated minor who was visiting California from another state.

The San Bernardino County Department of Public Health said the case is not related to a recently reported measles exposure connected to Disneyland.

During the infectious period, from Jan. 26 through Feb. 3, the individual visited a public location in Ontario. Public health officials said the person was at the Walmart Supercenter, 1333 N. Mountain Ave., on Jan. 29 between noon and 3 p.m.

People who were at that location during the identified timeframe may be at risk of developing measles, particularly those who are unvaccinated, immunocompromised or pregnant. Individuals identified through contact tracing may be contacted directly by County Public Health.

Public health officials advised anyone who feels ill or believes they may have been exposed to stay home and contact a health care provider immediately. Individuals are encouraged to call ahead before visiting a medical facility so precautions can be taken to prevent further spread. Wearing a mask when seeking care can also help reduce transmission.

High contagious virus

Measles is a highly contagious virus that spreads through the air when an infected person breathes, talks, coughs or sneezes. Symptoms typically appear seven to 21 days after exposure and often begin with fever, cough, runny nose and red eyes, followed by a red, blotchy rash that usually starts on the face and spreads downward. A person with measles can be contagious from four days before the rash appears to four days after.

Health officials warned that measles can lead to serious complications, including ear infections, pneumonia, diarrhea, brain swelling and, in rare cases, death.

Health officials recommend vaccination

“Vaccines are our best defense against infectious diseases, protecting both individuals and the wider community,” said Dr. Sharon Wang, San Bernardino County health officer. “Staying healthy and staying up to date with vaccinations is a key step in safeguarding public health and saving lives.”

Children are recommended to receive two doses of the measles, mumps and rubella vaccine, with the first dose given at 12 to 15 months of age and the second dose at 4 to 6 years old. Children between 6 and 12 months may receive an early dose if traveling to areas with increased measles activity. Teens and adults without documented MMR vaccinations are also encouraged to get vaccinated.

Residents unsure of their vaccination status can check the California Digital Vaccine Record or consult their health care provider. Those without a primary care physician can receive immunizations through county health centers by calling 800-722-4777 or visiting MyTurn.ca.gov.

Health care providers are required to report suspected measles cases immediately to the San Bernardino County Communicable Disease Section.

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