Health officials have issued a stark warning as the UK is set to be hit by a mumps epidemic - with teens and young adults most at risk The disease, which can leave patients infertile and even be fatal, is prevented by the MMR vaccine but uptake is at a 15-year-low - and has led to a surge in measles cases this year. Symptoms of the disease include swollen salivary glands, headaches , joint pain and fever. There were just 36 reports of mumps last year compared to 3,700 in 2020, so medics say a