Secondary schools in Swansea and Neath Port Talbot will be targeted in another round of school MMR vaccinations this week.
Over 1,700 pupils will be offered the jab in 10 schools across the areas.
Health experts have urged parents of pupils who have had no MMR or who need a second jab to take advantage of the school clinics.
Measles is a horrible disease and the number of cases is still growing, with the latest figure standing at 765. Children and teenagers who are not protected with MMR have a very high risk of catching measles.
MMR is a simple and safe jab which will protect them during this serious measles outbreak. I would urge parents of unvaccinated or under-vaccinated children to sign the consent form so our nurses can give them an MMR jab in school.
Around 3,400 people turned out to receive the MMR vaccination in the latest round of clinics in South Wales over the weekend.
2013 is expected to be the worst year for measles in the UK for the past two decades. Read more about the illness and how it is treated.
If the Government's top adviser on immunisation thinks the risk of an emergency in England is a possibility, I believe him.