Meningitis is a disease that causes inflammation of the lining covering the brain and spinal cord (called the ‘meninges'). It can be caused by a bacterial infection or a virus, or more rarely, by a fungal infection. Viral meningitis is the more common form of the disease and is also much milder - people with viral meningitis rarely die from the disease. Bacterial meningitis however, while relatively uncommon, is usually a much more severe disease and can be fatal.

Mumps is a contagious infection, caused by a virus called paramyxovirus. It can be a potentially serious disease for children and young adults. Mumps is most common in children over the age of two who have not been vaccinated. It is also common in teenagers and young adults, although older people may also contract the disease.