The Murrumbidgee Local Health District is reminding local residents of the symptoms of meningococcal disease, following a confirmed case in an 18-year-old man at Tumut.
They include headache, fever, weakness, drowsiness, confusion or coma, nausea and vomiting, dislike of bright lights, a rash of red-purple spots and a stiff neck.
Officials have been working to track down anyone who's had close contact with the man and provide clearance antibiotics.
To pass on the disease would usually require close and prolonged contact.
Experts say early identification and treatment of the disease is vital and in most cases the infection is effectively treated with antibiotics.