When Sarah Walton caught measles at nursery at just 11 months old, she was too young to get the vaccine that could have protected her from the life-threatening vrius.
She recovered well and didn’t suffer any serious illness, but 25 years later she developed a rare and “devastating” brain condition called subacute sclerosing pan-encephalitis (SSPE), which is caused by a mutation of the measles virus.
