“The cases are unrelated and at this time of the year Australia usually sees an increase in the disease.

“Early identification and treatment of the disease is vital, and it is important to remind the community, particularly parents and GPs, to remain alert to the signs and symptoms of this disease,” Ms Oakman said.

Symptoms include the following:

Sudden onset of fever;

Severe headache;

Weakness, drowsiness, confusion or coma;

Nausea and vomiting;

Dislike of bright lights;

Rash of red-purple spots or a stiff neck.

“Most cases are seen in young children and young

adults, although people of any age can be infected,” Ms Oakman said.

“Early detection and treatment can, in majority of cases, result in full recovery.”