Re MMR- As I understand it, in this generation of students, a proportion did not have the vaccine owing to Wakefield- related concerns at the time. This has led to herd immunuty being impaired, so the unvaccinated have been getting mumps. As the mumps vaccine is only about 80% effective anyway (the lowest level of effectiveness of the 3 vaccines in MMR), about 20% of vaccinated students who were exposed to others with mumps, were catching it.
I suppose the salient question is, if you can get a single booster before going to university, would it remedy a deficiency if you are one of the 20% for whom the previous 2 doses of MMR had not provided immunity from mumps? Is the 20% failure rate down to the individual or the vaccine?
I have no medical knowledge, I haven't a clue! DS's university had an outbreak earlier this year, so I have a particular interest. We have a very good private gp service locally, so I'll call them and ask and will update.