A public health warning has been issued urging people to watch out for signs and symptoms of measles after four cases of the disease were reported in Brunswick or east Brunswick in Melbourne. The acting chief health officer of Victoria, Roscoe Taylor said that all the cases have occurred in the Melbourne suburb of Brunswick, but are unrelated to each other

He said that four people including two women, all in their 20s, and another woman in her 40s have contracted the diseases over the past week.

“We are concerned that more people may have been infected from coming into contact with these people in the community,” Taylor said in a statement, as quoted by the ABC. “Measles has an incubation period of up to 18 days so illness acquired from contact could still be coming through, and cases could still remain infectious for many days.”

According to Taylor, cases of Measles are usually associated with international travels, as the vaccination program has successfully curbed the disease from occurring onshores. But this time, none of the four people diagnosed with the illness have traveled.

The SBS reported that the disease has an incubation period of 18 days. Thus, people have been warned against further cases in the coming days and urged to get vaccinated. The onset of measles is characterized by common-cold-like symptoms, with rashes erupting three to seven days later.

“Anyone developing these symptoms is advised to ring ahead to their doctor or hospital and alert them that they have fever and a rash,” the ABC quoted Taylor as saying. “If you know you have been in contact with a measles case please alert your GP or hospital emergency department.”

Earlier in January, health officials warned of a measles outbreak in Melbourne after two people diagnosed with measles attended a graduation ceremony, the Guardian reported. Victoria’s chief health officer, Rosemary Lester, said there could be further cases of the illness as many others were exposed to the duo, who were not vaccinated for measles.