The Health Service Executive has said it is dealing with an outbreak of measles in Dublin's north inner city.
Since July, 13 cases of the infectious disease have been reported, with both adults and children affected.
The Department of Public Health said transmission of the disease occurred in hospitals in Dublin and in households with what it described as "poor vaccine uptake".
There have been no reported deaths from measles associated with this outbreak to date.
Earlier this month, 11 cases of measles were notified to the HSE, which issued a warning that children who attended Temple Street Children's University Hospital may have been exposed.
Public Health Doctor Dr Ruth McDermott said the best protection against the illness is to be fully vaccinated with two doses of the MMR (Measles, Mumps and Rubella) vaccine.
The department has urged people who think they may have measles to stay at home and contact their GP for advice.
It also advises that people who are sick should stay away from school, créches, work or religious gatherings until they have recovered and any pregnant women who may have been exposed to measles should contact their GP as soon as possible.
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The department said that all children should get the MMR vaccine when they are 12 months, with a booster at age four to five. It urged adults under 40, who have not had measles or received two doses of the MMR vaccine, to contact their GP.
Symptoms of measles include a high fever, cough, runny nose, red eyes, a red rash that starts on the head and spreads down the body, lasting for between four and seven days.
People affected may also experience vomiting, diarrhoea and stomach pain.
There are ongoing outbreaks of measles in many countries and most cases reported in Europe this year were in Romania, France, Greece and Italy, with 13 reported deaths.
