The HSE has been notified this week of four measles cases in Dublin, affecting two adults and two children.
These four individuals are likely to have developed measles from contact with one of the two earlier cases at hospitals in Dublin which were confirmed last month.
The HSE has asked the public to continue to be vigilant about measles.
"Measles can be a serious illness and is highly infectious. The best protection is to be fully vaccinated with two doses of MMR (Measles, Mumps, and Rubella) vaccine," said Dr Helena Murray, Specialist in Public Health Medicine.
People at increased risk of getting measles are those who are not fully vaccinated with two doses of MMR vaccine or have not had measles in the past. The risk of measles is for up to 21 days after contact with a case of measles.
If you think you may have measles, stay at home and phone your General Practitioner (GP) for advice.
The Public Health Department has sent an alert to all Emergency Departments and GPs in Dublin, Kildare and Wicklow to inform them to be vigilant about measles and has issued the following advice on how to control the further spread of this potentially serious illness:
There are on-going outbreaks of measles in multiple countries in the European region and worldwide. Most of the cases in the EU in 2018 were reported from Romania, France, Greece, and Italy. Most people who get measles on holiday do not know they were exposed until they develop disease. Unrecognised exposures to measles have occurred at airports, on planes, at concerts, in shops and health care settings. In 2018, 31 deaths associated with measles have been reported in EU countries.
Vaccination remains the most effective measure against infection. Children aged 6-11 months of age, travelling to other countries and regions where measles outbreaks are reported, are recommended MMR vaccine. A dose given before 12 months of age does not replace the dose that would normally be given at 12 months of age.
Older children should be age-appropriately vaccinated. Children who have missed their recommended doses should get the MMR vaccine from their GP.
Adults may be at risk of measles, particularly those under 40 years of age who have never had measles or two doses of a measles vaccine.
Measles is highly contagious and is spread easily. The time between exposure to measles and developing the rash is usually 14 days (range 7-21 days). People are infectious from four days before rash starts until four days after.
Measles can cause chest infections, fits (seizures), ear infections, swelling of the brain and/or damage to the brain.
Measles is a notifiable disease and GPs and hospital clinicians should immediately notify Public Health if they suspect someone has measles.