Health authorities are worried about a fall in the number of children vaccinated against measles in Jersey.
Parents are being offered another chance to immunise their children
Only about 77% of island children have been vaccinated against Measles, Mumps and Rubella (MMR) - compared to a States target of 95%.
Dr Rosemary Geller, the Medical Officer of Health, is encouraging more parents to have their children vaccinated.
She says the number of children being immunised in Jersey fell after the MMR scare in 1998.
Although there have been no cases of measles in Jersey this year, Dr Geller said she is concerned about the reduction in immunisation.
Parents whose children are not vaccinated are being given another opportunity to have it done.
In England and Wales there have been about 450 confirmed cases of measles this year so far - an increase of almost 300 cases on the previous year.