Do vaccines cause disease?

Some studies in the past have suggested a link between vaccinations and certain medical conditions, such as asthma, multiple sclerosis, diabetes and autism. The allegations of a link are often made for a disease of unknown cause. The appearance of a certain medical condition after vaccination does not necessarily imply that they are causally related. In most cases, subsequent studies have indicated that the association is due to chance alone. The Measles, Mumps, Rubella / Autism myth has been completely debunked by such studies. Importantly, once an issue is raised, it needs prompt research, and if no association is found then discussion and education is required to avoid propagating a myth.