A 19-year-old woman has died on the Central Coast, after contracting meningococcal disease.
Mischelle Rhodes died at Gosford Hospital last week from an unconfirmed strain of the disease, with health authorities urging the community to be aware of the symptoms.
People in close contact with Mischelle have been given antibiotics to reduce the risk of the disease spreading.
Symptoms can include sudden onset of fever, headache, neck stiffness, joint pain, a rash of red-purple spots or bruises, nausea and vomiting.
Anyone experiencing these symptoms should seek medical advice immediately.