Measles is the reason, and it is not a mild illness
Measles is among the most contagious infections known. One case infects around fifteen unprotected people, the virus hangs in the air of a room for two hours after the infected person has left, and you are contagious for four days before the rash appears.
In roughly one case in fifteen it causes complications: pneumonia, middle ear infection, and in about one in a thousand an inflammation of the brain. It also strips existing immune memory, leaving people more vulnerable to other infections for years afterwards. Mumps and rubella are included in the same vaccine - mumps can cause deafness and meningitis, and rubella in pregnancy causes serious birth defects.
Why so many adults are short a dose
Two doses give lasting protection in around ninety-nine percent of people. One dose gives roughly ninety-three percent, which is good but leaves a gap.
A large group of UK adults - broadly those born between the late 1980s and the early 2000s - had one dose rather than two, or none, during the years when MMR uptake fell. Most have no idea. If you cannot positively account for two doses, the straightforward answer is to have one: there is no risk in an extra dose and no blood test needed first.
It is free on the NHS - and we will tell you that
MMR is available free from your GP at any age, for anyone who has missed a dose. We would be doing you a disservice not to say so on this page.
What we offer is timing. If you are flying in ten days and your surgery cannot see you for three weeks, or you want both doses a month apart around a fixed departure, we can do it now at the price published on our list. That is the whole of the difference, and it is your call.
A live vaccine, with the usual conditions
MMR is a live vaccine. It is not given in pregnancy, and pregnancy should be avoided for a month afterwards. It is not suitable where the immune system is significantly suppressed.
It can be given on the same day as other live vaccines, or otherwise four weeks apart. If your course includes yellow fever or dengue, the sequence matters and we will plan it with your travel dates in front of us.

