HSE has issued a warning to parents in Galway after the outbreak of mumps in recent weeks.
Parents at a school in Claregalway received the announcement after more children showed symptoms of the disease.
This happens after a series of reported cases in the region, especially among young adults aged 15-29.
HSE advises anyone who is not sure if they have received two doses of MMR vaccine to request an additional dose, RTE reports.
The vaccine offers the best protection against infections, but it should be noted that it may take up to 28 days before it enters into force.
Parents are also advised that all children with mumps-like symptoms should not be left in school for at least five days after the inflamed throat.
Last month, HSE issued a warning after 45 people were diagnosed with mumps in western Ireland in seven weeks.
However, experts warn that children can infect others just before the swelling is visible and the patients will experience other symptoms, such as sore throat and coughing.
Oreion can be spread by direct contact, such as saliva, but also by air particles after coughing or sneezing.
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