Four children have been hospitalised as 127 cases of measles are confirmed in Wales.
The four children were from the Burry Port area. Thirty-two others who have come into contact with them were given emergency vaccinations, according to the National Public Health Service for Wales (NHPS).
There have been four outbreaks, accounting for 69 of the cases in Mid and West Wales and 14 cases related to an outbreak in South Pembrokeshire, 46 cases in Llanelli and five in Neath Port Talbot.
The remaining 58 cases, in Pembrokeshire, Carmarthernshire, Powys, Swansea, Neath Port Talbot and Bridgend, are sporadic with no clear connection to the three outbreaks.
Dr Mac Walapu, consultant in communicable disease control for the NPHS, said: ‘For as long as there are children who do not receive their MMR vaccinations, there is the potential for outbreaks of measles to happen.
‘There is no evidence of any child being harmed by the MMR vaccination but there is strong evidence that as many as one in 500 children who catch measles will die, and that another one in 500 will suffer permanent brain damage.
‘With so many cases in the community, any child who has not received vaccination is at risk and parents must be aware of the potential consequences of not arranging immunisation for their children.’