A second person in Ireland has been confirmed as having measles, and is based in the west of the country.
Measles is a highly infectious disease, particularly in children under one, pregnant women, and the immunosuppressed.
The HPSC said it was notified yesterday of the case - which is understood to involve a teenager.
The HSE is finalising plans for the roll out of a MMR vaccine catch-up programme in response to a rise in measles case in the UK and Europe.
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The first confirmed case here this year led to the death of a person in early February.