The first case this year led to the death of a Westmeath man.
The HSE has confirmed a fourth case of measles in Ireland.
It says one in five people who catch the disease will be hospitalised.
With an outbreak in the UK and across Europe, there's a heightened awareness of measles among clinicians here.
The first confirmed case here this year, led to the death of a Westmeath man in early February.
Parents are being urged to arrange a catch-up vaccines for their children, and the HSE are saying "it's not too late to be vaccinated."
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