These vaccines are useful for administration to humans and other animals at {HEAD ~ risk} of {TAIL ~ exposure} to C. difficile toxins 
of
These vaccines are useful for administration to humans and other animals at { HEAD ~ risk } of { TAIL ~ exposure } to C. difficile toxins
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH