MORE tests will be carried out on a Swansea man who died while suffering from measles.
A post-mortem examination into the death of Gareth Colfer-Williams proved to be inconclusive.
The 25-year-old died at his Port Tennant home last Thursday.
Meanwhile, measles cases in Swansea are still increasing and more than 900 people have the disease.
New figures from Public Health Wales show 942 people have been diagnosed with the highly contagious disease and youngsters are being urged to have the MMR jab ahead of their exams.
An extra 56 cases have been reported since Tuesday, showing there is no sign of the outbreak ending and the 10 to 18 age group are most at risk.
Although the outbreak is centred mainly on Swansea, rates of measles are high throughout the Abertawe Bro Morgannwg University, Powys and Hywel Dda health board areas, especially in Neath Port Talbot and North Powys.
A total of 83 people have been hospitalised since the beginning of the outbreak.
Dr Marion Lyons, Director of Health Protection for Public Health Wales, said: "The increase of cases shows that the outbreak is not easing up, especially in the 10 to 18-year-old age group.
"Young people have important examinations coming up and we need to make sure that those aged between 10 and 18 are vaccinated so their preparation for these examinations are not affected.
"Vaccination sessions are continuing in schools throughout Wales and I urge pupils and their parents to take advantage of these.
"We have seen that measles can be potentially fatal and no one should be complacent about the severity of measles. It can kill but can be prevented by a simple, safe vaccine."