Health officials are urging people to have both parts of the MMR vaccine after cases of mumps in England reached their highest level in a decade.
Outbreaks in universities and colleges raised the number of cases of the painful viral illness to 5,042 in 2019 – four times the number in 2018.
Most were in young adults who missed out on the MMR jab.
Public Health England said the full two doses of the vaccination were needed to maximise protection.
The vaccine prevents most cases of mumps – but not all, and so some young people are still getting the illness.
What is mumps?
It is a viral infection that used to be very common in children before the MMR (measles, mumps and rubella) vaccine was introduced in the UK in 1988.
A classic sign is puffy cheeks under the ears.
Mumps is contagious and spread through infected droplets of saliva breathed in through the mouth or nose.
What are the symptoms?
- painful swelling of the glands at the side of the face
- joint pain
- feeling tired
- loss of appetite
Most people usually recover without treatment.
But in rare cases, there can be serious complications, such as inflammation of the testicles in males, meningitis and deafness.
Source: NHS UK
What does it feel like?
"I went to bed normal, everything fine, and then I woke up, and bang – my face was so puffed out, so swollen," says Olly Finch, a student at Leeds University.
"I got prescribed morphine – it was that bad."
Flora Cox, another Leeds student, said: "It started out with just neck pain in my ear and jaw, and then it started swelling – it was so painful.
"Your jaw pretty much locks."
How can I protect myself?
The best and safest way is to get two doses of the MMR vaccine – the middle 'M' stands for mumps.
It's never too late to catch up, says Dr Vanessa Saliba, from Public Health England.
"We encourage all students and young people who may have missed out on their MMR vaccine in the past to contact their GP practice and get up to date as soon as possible," she said.
The part of the triple vaccine that specifically protects against mumps isn't quite as effective as the elements protecting against measles and rubella.
However, getting the jab is still crucial – because the more people who are protected, the less likely mumps is to be shared around.
Even if you get the illness after being vaccinated, you are likely to have a less serious form of it and fewer complications.
Why do outbreaks happen?
Cases of mumps consistently outnumber measles and rubella every year.
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