The move was proposed at the British Medical Association's annual meeting in Harrogate on Wednesday.

Officials will now draw up a report on the advantages and disadvantages of mandatory immunisations and vaccinations.

It follows concern about falling uptake of MMR and a recent rise in measles cases.

Safety fears

Many parents have refused to allow their children to be given the three-in-one vaccine after a study suggested it may be linked to autism.

Statistics from the Public Health Laboratory Service, published last month, show just 70% of 16 month-olds received MMR vaccinations in March - down 6% since the end of last year and well below the government's target of 95%.

Some doctors believe the UK should follow the example of other countries by making MMR vaccination compulsory.

Mayor under attack

Doctors at the conference criticised comments by London Mayor Ken Livingstone earlier this week advising parents against allowing their child to have the triple vaccine.

He added: "He will have done irreparable damage, damage that takes a long time to put right."

The comments come just hours after one of the key researchers in the MMR safety debate issued a statement saying the triple vaccine is safe.

Professor John O'Leary, of Trinity College Dublin, has investigated studies suggesting a link between the vaccine and autism.

He has been widely reported as being against the three-in-one vaccine.

But in a statement, he denied his studies ever suggested MMR was unsafe.

"This research in no way establishes any link between the MMR vaccine and autism," he said.

"We advocate the use of MMR to protect children from measles, mumps and rubella."

He added: "It is wrong for parents not to immunise their children."

'No link'

Dr Simon Fradd, of the BMA, welcomed the statement.

"It means there is no link between Crohn's, autism and the MMR vaccine.

"It means we needn't put children at risk. Parents can now with confidence have their children immunised against these dreadful diseases."

Dr Bogle added: "The scientific evidence shows that MMR is the way forward to give maximum protection to children in this country."

Earlier this week, doctors attending the conference called for the payments they receive for vaccinating children against mumps, measles and rubella to be scrapped.

They said the payments meant many parents did not trust them to give impartial advice on the safety of the vaccine.