The adjuvant’s role in the enhancing the vaccines’ elicited immune response to be appreciated and supported in more study. Only 3 adjuvants are currently used today in the US.
The goal of the NIAID’s new research grants is to find new adjuvants and thus more available options to enhance vaccine efficacy particularly for people with weaker immune systems and to extend vaccine supply etc… http://www.nih.gov/news/health/sep2014/niaid-29.htm
Read more on NIAD’s Strategic Plan for more research on these “vaccine assistants” http://www.niaid.nih.gov/about/organization/dait/adjuvantplan/Pages/default.aspx