Answer: antitoxin

AnswerCrossword Clue
ANTITOXINImmunity offerer
ANTITOXINNeutralizer of a sort
ANTITOXINType of neutralizer
ANTITOXINGerm fighter
ANTITOXINBacteriologist's discovery
antitoxinAn antibody that counteracts a toxin
antitoxinan antidote to a toxin