Doctors have found more evidence to suggest that children who develop glandular fever may have an increased risk of multiple sclerosis. Doctors in Canada carried out tests on 120 children, 30 of whom had MS. They found those with MS were twice as likely to be infected with the virus that causes glandular fever. Writing in the Journal of the American Medical Association, they said the findings suggested the virus may play a role in the development of MS. Previous studies have suggested that there may be a link between Epstein-Barr virus and MS. However, it has been difficult to prove, not least because so many people have had glandular fever.