TWO new cases of measles have been confirmed for Ipswich, bringing the number of recorded cases in the city to seven.

West Moreton health officials are warning residents who visited Redbank Plaza on the afternoon of September 18 to be alert for symptoms after a woman visited the area while unknowingly infectious with the disease.

West Moreton Hospital and Health Service public health physician Dr Heidi Carroll said another person had also been confirmed to have measles but had not gone out during the infectious period.

Dr Carroll said measles was one of the most infectious of all communicable diseases and was spread by tiny droplets through coughing and sneezing.

"True measles is a serious viral infection that causes fever, cough, runny nose, then a red spotty rash and sore eyes a few days later," Dr Carroll said.

"Symptoms usually start around 10 days, but can occur between seven and 18 days after infection so anyone who develops measles-like symptoms within the next week or two should contact their GP for advice.

"It is very important to call the medical practice first to say you could have measles, so that staff can take precautions to avoid spreading the disease to others."

Any complications could be serious.