Health chiefs fear one of the biggest measles outbreaks in Wales will become fatal after figures showed 207 people are suffering from the virus.
Several people have been treated in intensive care units after the worst outbreak of the disease in years.
The National Public Health Service (NPHS) is urging parents to ensure their children are vaccinated.
Dr Marion Lyons of the NPHS said: "Any child who is overdue for vaccination is at risk."
The mid and west Wales areas have seen 147 cases, with 23 people admitted to hospital.
Eighty-nine of the cases in mid and west Wales are linked to four outbreaks in south Pembrokeshire, Llanelli, Burry Port and Neath Port Talbot areas, while the others are sporadic cases across seven county areas.
In Llandudno, there are 53 cases with two people taken to hospital, linked to outbreaks in two schools, Ysgol Ffordd Dyffryn and Ysgol John Bright.
Five of the seven in south east Wales cases have family links to the mid and west Wales cases while the others are sporadic.
'Immunisation'
Dr Marion Lyons, head of the health protection teams for the NPHS, said: "For as long as there are children who do not receive their MMR vaccinations, there is the potential for people to become ill with measles.
"With so many cases in the community, any child who is overdue for vaccination is at risk and we are urging parents who have still not arranged immunisation for their children to act immediately.
"MMR is a safe vaccine that protects children from the most severe viral rash illness of childhood.
"There is strong evidence that worldwide, as many as one in 500 children who catch measles will die, and another one in 500 will suffer permanent brain damage.
"With 26 people now admitted to hospital because of these measles outbreaks - some of them having spent time in intensive care units - we fear it is only a matter of time before someone dies or is left permanently affected by measles.
"The people most at risk of catching measles are children of school age or children between the ages of one and four who are not up-to-date with their vaccinations.
"Although we are seeing cases of measles in adults, it is rare for anyone born before 1970 to catch measles."
'Infectious'
The NPHS said many people who catch measles will have a fever, cough, red eyes, and blocked nose and feel generally unwell. The blotchy rash appears a few days later beginning on the face and spreading downwards to the rest of the body over several days.
Typically, the organisation added, people will be infectious from the day before their first symptoms until four to five days after the appearance of the rash.
Dr Lyons explained: "If your child is unwell and you suspect it is measles, you should contact your GP. Your child should not attend school or nursery for five days after the rash starts.
"After completing a two-dose course of the MMR vaccine - which also offers protection against mumps and rubella - 99% of children will be protected against measles."</p
The parents of a US teenager who ran away with his mother after refusing treatment for cancer have said he can now be given chemotherapy.
Daniel Hauser, 13, has Hodgkin's lymphoma and had been warned that he would die without medical attention.
But his mother, Colleen, had said her religious beliefs meant she wished to treat his cancer with natural methods.
A judge had ordered Daniel to be placed in foster care but repealed the order on condition that he receive treatment.
Mrs Hauser told a court hearing in Brown County that she now believed chemotherapy was the best option for her son, reported the Associated Press news agency.
Judge John Rodenberg said Daniel should remain with his parents but that "this course of chemotherapy has to commence and commence soon".
"Danny loves his parents and they love him. He's a fine boy, a very pleasant young man," he said.
"I know he should be in the custody of his parents - as long as I'm satisfied they are going to follow the prescribed course of treatment."
But county prosecutors objected to the withdrawal of the earlier custody order, saying they were concerned the family could pull out of treatment again.
"These folks have had a history of changing their minds," said Brown County prosecutor James Olson.
Nationwide search
Daniel underwent one round of chemotherapy in February, but stopped after that single treatment, citing religious beliefs.
He and his mother failed to attend a court hearing last Tuesday after a court-ordered X-ray showed Daniel had a tumour in his chest.
After a week-long nationwide search, the pair surfaced in California and returned to Minnesota on a charter flight.
"They wanted to get together with their family, they wanted to be home," said Brown County Sherriff Rich Hoffmann.
He said Daniel was "immediately" given a full medical check.
Defence lawyer Jennifer Keller said she understood Mrs Hauser now intended to "abide by whatever orders the court makes".
But she told America's ABC News that Mrs Hauser "also wanted to put her best case forward for her son to have a chance at alternative treatment". </p
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