Figures released later today are expected to show that the Swansea measles epidemic is continuing to grow.
So far 541 people have been diagnosed with the virus since November.
Doctors have said the potentially fatal virus is spreading at an "alarming rate" and have issued an urgent appeal for children to be inoculated.
A man who died in from a suspected case of measles in Wales was infected with the disease at the time of his death, health officials said.
A mother convinced the MMR vaccine led to her son's autism has not immunised her daughter, despite the link being disproved.