Figures released by Public Health Wales reveal there have been 1,336 confirmed cases of measles across Wales since November - a rise of 11 since Tuesday.
In 2011 there were just 19 reported cases in Wales.
Figures from Public Health Wales show that more than 60,000 people have received the MMR vaccination in Wales since the beginning of March.
But health chiefs say they are 'concerned' for the 33,000 children aged 10 to 18 who remain unvaccinated.
In spite of the slowdown in new cases health officials are warning people against complacency.
– Dr Sara Hayes, Director of Public Health at ABM
Numbers of measles cases being reported are slowing and this is good news. However, measles is still circulating in our community so we need to remain vigilant and keep going with our MMR programme. The importance of everyone having two MMRs, especially school age children, is still our priority.
We’ve had a brilliant response from the public, giving over 8,500 MMRs in our drop-in clinics alone, which is more than we hoped we would.
A drop in clinic is being held tonight in the Outpatients department of the Princess of Wales Hospital in Bridgend between 6pm and 9pm.
Public Health Wales will publish the latest figures for the number of people with measles later today. The outbreak appears to be slowing down with the latest figures showing an increase of 20 cases in south and mid-Wales, but health officials are still urging people to get vaccinated.
Young people aged 10 -18 are the age group that have been hardest hit and doctors are keen to stress that measles is a serious, and even potentially fatal, disease.
Throughout Wales there have now been 1,325 cases of measles since the start of November 2012 – compared with only 19 cases in the whole of Wales in 2011.
The measles outbreak in the Swansea area is showing signs of slowing down - but health chiefs stress it would be 'dangerous' to become complacent.
Figures released yesterday revealed another increase in the number of measles cases, but at a less rapid rate.
But the area's Director of Public Health warned: "It would be dangerous to take our eye off the ball now".
– Dr Sara Hayes, Director of Public Health, Abertawe Bro Morgannwg University Health Board
Numbers of measles cases being reported are slowing and this is good news. However, measles is still circulating in our community so we need to remain vigilant and keep going with our MMR programme. The importance of everyone having two MMRs, especially school-age children, is still our priority.
The number of cases reported as part of the outbreak centred on the Swansea area has reached 1,125 - an increase of 20 over the last five days.
– Dr Marion Lyons, Director of Health Protection for Public Health Wales
This is the final week that children in schools across Wales will be offered the MMR vaccination, so parents whose children have not yet been fully vaccinated with two doses of MMR are reminded to complete the consent form to ensure the vaccine can be given.
The MMR is also available through GP surgeries, and more than 3,500 doses of MMR have been given in Welsh GP surgeries in the last seven days, which is a great sign that people are still coming forward for the vaccination.
There have now been 1,325 cases of measles in Wales since last November.
Public Health Wales has released the latest figures - which show 33 new cases since last Thursday.
It is a bigger increase than that reported a week ago, but much smaller than in previous weeks and months.
Public Health Wales will publish their latest figures for the measles outbreak at lunchtime. Last week the figures showed there were 1,292 cases across Wales and 1,105 confirmed in the outbreak area centred on Swansea.
Further MMR vaccination clinics are being held across Wales today as part of continuing efforts to stem rise in measles cases.
The latest figures show there are 1,292 confirmed cases across Wales, with 1,105 in the Swansea area alone.
Over 50,000 MMR vaccinations have been given since March, but Public Health Wales says that over 35,000 10-18 year olds are still unvaccinated.
Health chiefs have expressed concerns over a further outbreak of measles in the Gwent area where there have now been 100 reported cases of measles this year and over 8,000 10-18 year olds remain unvaccinated.
Vaccination clinics are being held today at:
Singleton and Morriston Hospitals in Swansea between 10am and 4pm
Princess of Wales Hospital, Bridgend, between 10am and 4pm
Neath Port Talbot Hospital between 10am and 4pm
Royal Gwent Hospital, Newport between 11am and 3pm
Drop-in sessions are also being planned in the Brecon and Newtown areas on 25th May.
More than 3,000 people in Merthyr and Rhondda Cynon Taf were given the MMR vaccine in an attempt to stem the spread of measles.
But Public Health Wales says it's still concerned that only half of these were given to people aged between 10 and 18 - the group hardest hit by the outbreak.
Figures today revealed there have been a total of 1,292 cases reported across Wales since the beginning of November 2012.
More than 50,000 people have had the MMR jab as efforts continue to stem the measles outbreak.
According to the latest figures from Public Health Wales there has been a total of 1,292 cases of measles reported across Wales since the beginning of November