The Hawaii Department of Health has confirmed a case of mumps in an individual on Hawaii Island.

The case is not travel-related, suggesting that mumps may currently be circulating on the island, according to the DOH.

The individual attended an event at Harold H. Higashihara Park in Kailua-Kona on Thursday, Sept. 25, between 4:30 and 6 p.m. DOH advises anyone who attended this event to contact the department for guidance.

DOH is working with the case’s family, health care providers and Hawaii County officials to identify and notify close contacts.

Individuals who develop symptoms should isolate immediately and contact their health care provider. Health care providers should evaluate patients who report exposure at the event for symptoms of mumps and verify their vaccination status.

People who were at the event should monitor themselves for symptoms until Oct. 20, 2025 (25 days after exposure), according to the DOH. Anyone who develops symptoms should isolate for five days after symptom onset.

Mumps is a contagious viral illness that spreads through coughing, sneezing, talking or sharing items such as cups or eating utensils. Symptoms typically appear 12 to 25 days after exposure.

There is no specific treatment for mumps. Care focuses on rest, fluids and fever control.

The DOH noted that while most people who fall ill with mumps recover fully, it can cause serious illness in some, including inflammation of the testicles or ovaries, pancreatitis, inflammation of the brain (encephalitis) or tissue covering the brain or spinal cord (meningitis), and loss of hearing.

“While mumps is preventable with vaccination, even one case is concerning because of how easily the virus spreads,” State Epidemiologist Dr. Sarah Kemble said in a news release. “We encourage all Hawaii residents to check their vaccination records and ensure they and their families are fully protected with two doses of the MMR (measles, mumps, rubella) vaccine.”

Children should receive two doses of the MMR vaccine by age 6. Adults born in or after 1957 should have documentation of vaccination or a blood test showing immunity. Certain adults at higher risk of exposure may need an additional MMR dose.

The MMR vaccine is available at local pharmacies. To find a vaccination location, visit vaccinefinder.org. Contact the pharmacy or clinic beforehand to confirm vaccine availability and any restrictions. Pharmacies cannot vaccinate children younger than 3.