While the areas visited were in Leeton, Griffith and Wagga, the alert has been issued across the entire Murrumbidgee Local Health District region due to the contagious nature of the illness.
The person with measles recently returned from South-East Asia where there is an ongoing outbreak of measles.
The person made two visits to Leeton Hospital, on June 5 and 6, Griffith Base Hospital Emergency Department on June 6 and Wagga Wagga Base Hospital Emergency on June 7.
MLHD public health physician, Dr Anton Forsyth, said anyone who visited the above locations should monitor for symptoms.
“Measles is a vaccine preventable disease that is spread through the air when someone who is infectious coughs or sneezes,” Dr Forsyth said.
“Symptoms to watch out for include fever, runny nose, sore eyes and a cough, usually followed three or four days later by a red, blotchy rash that spreads from the head to the rest of the body.
“It can take up to 18 days for symptoms to appear after an exposure, so it's important for people who visited these locations to look out for symptoms up until at least June 25.
“If they develop symptoms, they should call ahead to their GP or emergency department to ensure they do not spend time in the waiting room with other patients.
“We want to remind the community to make sure they are up to date with their vaccinations. The measles vaccine can prevent the disease even after exposure, if given early enough.
“Anyone born after 1965 needs to ensure they have had two doses of measles vaccine. This is especially important before overseas travel, as measles outbreaks are occurring in several regions of the world at the moment."