Dubbo and Western NSW Local Health District residents are being advised not to drop their guard when it comes to measles because of the possibility of "undetected infections".
The health district is eager for residents and doctors to keep watch for the disease despite reporting of "no new measles cases".
In mid-April Dubbo residents were alerted to a visit to the city by a traveller suffering from measles.
The 22-year-old man, who was not vaccinated, was diagnosed with the highly-contagious disease after returning from a three-week trip to New Zealand.
Residents who had not received two doses of measles vaccine and might have come in contact with the infectious man at specified locations including Dubbo Hospital's Emergency Department, were told to watch for symptoms.
"If you are unsure whether you have had two doses, it is quite safe to have another dose and the MMR (measles, mumps, rubella) vaccine is free via GPs for anyone born during or after 1966 who hasn't had two doses," the health district's public health manager Priscilla Stanley said at the time.
In late April more cases were reported.
NSW Health's director communicable diseases Vicky Sheppeard said residents who might be "susceptible to measles" and were at the same locations as the men should be on the alert for symptoms.
This week the health district said the period when secondary infections were likely to occur had passed.
"However, doctors and residents should remain alert for signs and symptoms of measles, in case undetected infections have occurred," its spokeswoman said.
The health district is reiterating that all parents and young adults should check their vaccine records.
"Two doses of measles vaccine provides lifelong protection in 99 out of 100 people who are vaccinated and again, we urge anyone who is travelling overseas to please ensure they get their jabs," the spokeswoman said.
Measles is spread by the breath, cough or sneeze of an infected person.
The main symptoms of measles include a fever, cough, runny nose, sore and red eyes, lethargy and a non-itchy, spotty rash that starts on the face and neck and spreads to other parts of the body.