from The Century Dictionary.
- noun A poison produced by the tetanus bacillus, to which the tetanic convulsions are due.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
Sorry, no etymologies found.
I have yet to see any evidence that any putative "toxin" in vaccines is more dangerous than the toxins produced by actual infection with vaccine-preventable diseases, such as tetanospasmin, tetanolysin, diphtheria toxin and pertussis toxin.