Dr Tony Hill, Joint Director of Public Health in Lincolnshire, is urging teenagers to go and get vaccinated against measles.
Letters are being sent out to the parents of up to ten thousands 10 to 16 year olds in Lincolnshire, who it's feared aren't fully protected against measles.
The Joint Director of Public Health for the county says thousands of youngsters didn't receive two doses of the MMR jab when they were younger due to a low uptake, so aren't fully protected.
Even those that have had measles are being advised to still have both doses of the vaccine. The action follows a large outbreak of the infectious disease in parts of Wales.
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 Government is launching a £20 million campaign to vaccinate a generation of children thought to be the cause of a measles outbreak.
This year is on course to be the worst year for measles outbreaks in two decades.
Already, in the first three months there have been 587 cases in England.
For more information visit the Get Vaccinated England Facebook page.
A national programme to increase MMR vaccination uptake in children has been announced today.
It comes after 48 people were diagnosed with the disease in Yorkshire and North Lincolnshire in the last three months.
The aim of the programme, led by Public Health England, NHS England and the Department of Health, is to prevent measles outbreaks by vaccinating as many unvaccinated and partially vaccinated 10-16 year olds as possible in time for the next school year.
New figures published today show high numbers of confirmed measles cases in England in the first three months of 2013, reaching 587 by end of March, following a record annual high of almost 2,000 cases in 2012.
Dr Mary Ramsay, Head of Immunisation at Public Health England said, “Measles is a potentially fatal but entirely preventable disease so we are very disappointed that measles cases have recently increased in England.
"Those who have not been vaccinated should urgently seek at least one dose of MMR vaccination which will give them 95 per cent protection against measles. A second dose is then needed to provide almost complete protection.
"Measles is not a mild illness – it is very unpleasant and can lead to serious complications as we have seen with more than 100 children in England being hospitalised so far this year."
Health officials in North Lincolnshire are urging parents to ensure their children's vaccinations are up-to-date. It comes after three children were diagnosed with measles in the past few weeks.