Another measles case linked to the University of Queensland's (UQ) St Lucia campus has been confirmed, bringing the total number of cases to six in just five weeks.

The Darling Downs Public Health Unit said the person became ill after coming into contact with the first recent measles sufferer from UQ, who was diagnosed in mid-July after returning from overseas.

The fifth case was confirmed on Friday.

The Health Unit has issued an alert after the latest person to contract the virus visited Toowoomba last week.

They visited the Spotted Cow Hotel on Saturday August 15 while infectious.

Darling Downs Public Health Unit Director Dr Penny Hutchinson said management of the Spotted Cow had been advised of the case so they could let staff and patrons who were at the hotel last Saturday know.

Dr Hutchinson said there was the potential for subsequent cases to appear as a result of contact with the infected person weekend.

However, she emphasised, there was no ongoing risk at the Spotted Cow.

Dr Hutchinson said symptoms usually started around the 10-day mark, but could occur between seven and 18 days after contact with an infectious person.

What is measles? Acute, highly infectious illness spread by coughing and sneezing

Acute, highly infectious illness spread by coughing and sneezing Can cause serious complications such as pneumonia and encephalitis (inflammation of the brain)

Can cause serious complications such as pneumonia and encephalitis (inflammation of the brain) Symptoms include fever, tiredness, cough, runny nose and/or red inflamed eyes, becoming more severe over a few days, followed by a blotchy, dark red rash that spreads over the entire body

Symptoms include fever, tiredness, cough, runny nose and/or red inflamed eyes, becoming more severe over a few days, followed by a blotchy, dark red rash that spreads over the entire body To be immune, you need to have received two doses of the measles, mumps, rubella (MMR) vaccine at least one month apart

To be immune, you need to have received two doses of the measles, mumps, rubella (MMR) vaccine at least one month apart Unvaccinated, pregnant or immune-compromised people who suspect they might have measles should seek medical attention immediately

"Measles is one of the most infectious of all communicable diseases and is spread by tiny droplets through coughing and sneezing," Dr Hutchinson said.

"It is a serious viral infection that causes fever, cough, runny nose, then a red spotty rash and sore eyes, but this is a few days later. The infectious period starts before the rash occurs.

"Anyone who develops measles-like symptoms within the next week or two should stay home and contact their GP for advice.

"If you do need to seek treatment, 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."

Symptoms include a cough, fever and runny nose with the person contagious before the telltale red rash appears.

Special vaccination clinics have been set up at UQ to control the outbreak.