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Public Health Wales say that the number of cases of measles in the Swansea area has reached 252.
Within the past week, 43 new cases have been reported.
The disease has now spread to children in 64 secondary and primary schools and nurseries across the area, with numbers of new cases doubling weekly.
The majority of the new cases are in the Swansea area, but cases are being reported across South East Wales.
Twenty new cases of measles have been reported as the outbreak in the Swansea area continues.
Public Health Wales is continuing to urge parents to ensure their children receive the MMR vaccination as it investigates the new cases in the Swansea and Neath Port Talbot area.
The new cases bring the total number of cases to 209. The majority of the latest infections are in the Swansea area.
Dr Marion Lyons, Director of Health Protection for Public Health Wales, said that "measles is a very contagious disease."
Parents of all children aged between one and 18 who have not been fully vaccinated are being advised to contact their GP for advice and to get their child vaccinated as soon as possible.
The director of health protection for Public Health Wales says she fears 'it is only a matter of time' before someone dies as a result of the latest measles outbreak.
Public Health Wales is urging parents to ensure their children are fully vaccinated against measles, saying it is 'the only effective way' of protecting against the illness.
It added that it is working closely with Abertawe Bro Morgannwg University Health Board to combat the outbreak.
Almost 200 cases of measles have been diagnosed in the Swansea and Neath Port Talbot areas since November, with 20 cases identified in the last week alone.
Symptoms can include:
- Red eyes
- Blocked nose
- Blotchy rash beginning on the face and spreading downwards to the rest of the body over several days
Typically people will be infectious from the day before their first symptoms until four to five days after the appearance of the rash.
Source: Public Health Wales
Health chiefs say they 'continue to be concerned' at the number of cases of measles in the Swansea and Neath Port Talbot areas.
Nearly 200 people have been diagnosed since the outbreak started in November, with 20 new cases in the last week alone.
More than 30 schools and nurseries have been affected so far.
Public Health Wales says it is working closely with Abertawe Bro Morgannwg University Health Board to combat the outbreak.