Vaccine has an open access companion journal titled Vaccine: X.

Vaccine is unique in publishing the highest quality science across all disciplines relevant to the field of vaccinology – all original article submissions across basic and clinical research, vaccine manufacturing, history, public policy, behavioral science and ethics, social sciences, safety, and many other related areas are welcomed. The submission categories as given in the Guide for Authors indicate where we receive the most papers. Papers outside these major areas are also welcome and authors are encouraged to contact us with specific questions. We also invite authors to submit relevant basic science and clinical reviews, methodological articles, opinion and commentary pieces, visual pieces, and letters. Authors are required to consult the Guide for Authors as the submission guidelines are dynamic and therefore subject to change.