Just thought I would raise awareness of this - thread below includes a link to getting your teen/young adult vaccinated:
www.mumsnet.com/Talk/guest_posts/3116631-Guest-post-Christmas-is-often-peak-season-for-meningitis-and-septicaemia-I-found-out-the-hard-way
Also see the MN Christmas Appeal and donate if you can (link also in above thread).