The Welsh health minister is considering options around checking the vaccine records of children as an entry requirement for school and nursery.
Edwina Hart said she was prepared to "explore further the options" for a compulsory childhood vaccination policy for Wales.
Ms Hart added that they would need to weigh higher vaccination levels against "the controversy likely to ensue".
A measles outbreak across the country has seen 253 cases of the disease.
Children in the UK are offered vaccination against measles as part of the MMR vaccine, which is given to them between 12 and 15 months of age (with a booster dose before they start school).
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http://news.bbc.co.uk/1/hi/wales/8079770.stm