Deputy Prime Minister Nick Clegg has urged parents to overcome their apprehension about the MMR jab.
Speaking to LBC 97.3 Radio, he said: "I really would urge parents, whatever your misgivings, do what people who know about this most say is right for your children - get that course of jabs done."
The most effective way of preventing measles is the measles, mumps and rubella (MMR) vaccine.
The first MMR vaccination should be given when your child is around 13 months old. A booster is given before your child starts school.
If your child is younger than 13 months and you think they may have been exposed to the measles virus, see your GP immediately.
The MMR may be given if they are over six months old, or they may be given antibodies for immediate protection if they are younger than six months old.
The NHS Choices website has more information on the MMR jab.
A programme is being launched today to try to get more children vaccinated against measles because of an outbreak in South Wales. In the West Midlands so far this year there have been 13 confirmed cases and 15 in the East.
Health experts in the Midlands are preparing for a measles outbreak with many areas of the UK affected. Find out more information hereRead the full story ›
A council in the Midlands is highlighting the importance of the MMR vaccination following a Measles Virus epidemic.
Derby City Council is urging parents who haven't already done so to get children vaccinated against the virus.
The majority of cases in the current outbreaks have been reported in unvaccinated school children and young adults.
We estimate that 4,000 – 5,000 children and young people between 10 and 20 years of age in Derby are not vaccinated against measles and so are not protected against the virus.
Measles is a highly infectious disease that spreads very easily and in some cases can cause serious complications and death.
Health officials have told ITV News Central they are bracing themselves for a potential outbreak of measles. Officials in Herefordshire fear the epidemic in Wales means an outbreak is 'on the doorstep'.
They say that so far this year they've already had the same number of cases as they had for the whole of last year. Charlotte Grant has been speaking to one family, who knows how frightening measles can be.
A study has revealed one in five children in Herefordshire are not fully immunised against measles. Click here for more information.Read the full story ›
"Measles is a highly infectious and potentially dangerous illness which spreads very easily particularly in schools.
It is crucial that children and young adults are fully immunised with the necessary two doses of MMR".
"The good news is that it is highly preventable when children are immunised with the MMR vaccine, but parents need to make sure their children receive two doses of the vaccine in order to be fully protected against measles.
We are seeing an increase in the number of cases as a direct result of parents not getting their children immunised."
Health professionals in Herefordshire are preparing for a measles outbreak after it's emerged that one in five children in the county are not fully immunised.
It follows a recent outbreak of the disease in South Wales. Parents are being urged to ensure their children have had two MMR jabs.