Government officials were made aware of some problems with a version of the MMR vaccine in other countries but still introduced it in Britain in the late 1980s, newly released documents show. The MMR vaccine with the Urabe strain of mumps was first used in Britain in October 1988. It was blamed for the deaths of several children after being withdrawn by the Department of Health in September 1992. Previously confidential documents released under the Freedom of Information Act show how officials gradually learned of the dangers of the Urabe strain MMR which caused encephalitis-type conditions, including meningitis. Many months before the Urabe MMR vaccine was introduced in the UK, officials were made aware of problems in America, Sweden and Canada. The first warning came when an unnamed official at a meeting of the Government's Joint Committee of Vaccination and Immunisation in May 1987 expressed his reservations concerning reported adverse reactions to MMR in the USA". The second came in a letter from ... Sweden in September that year, where authorities reported "52 cases of febrile convulsions probably associated with MMR vaccination". Then, a Government working party ... learned of "a report of cases of mumps encephalitis'' in Canada at a meeting in Feb 1988. The UK went ahead with its nationwide MMR programme in October 1988 in which 85 per cent of the triple-vaccinations contained Urabe.