After severe reactions to first vacinations we have decided not to risk it with the MMR, however, I have read that there's a shortage for mumps vacine. How long did it take you to complete the full course? (between the first vaccine and mumps which I believe is the last to be administered)?
as I expect the demand would have increased therefore the waiting must be longer as well so, if you have used sepvax, how long ago did you completed the course?