What Does SAFE Mean With Vaccines?

The first book in the history of vaccines, that provides the official meaning of SAFE, as it relates to vaccines.
Very well sourced, and why is no one talking about its official meaning, oppose to what most people assume? People at the hospital that I work at are using this book for their religious exemption against the required flu-shots and any other vaccine that is required for school, work or that may become mandatory again. Inform yourselves and love ones.