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