{HEAD ~ Vaccines} which prevent {TAIL ~ the morbidity} and mortality associated with clostridial diseases are provided 
prevent
{ HEAD ~ Vaccines } which prevent { TAIL ~ the morbidity } and mortality associated with clostridial diseases are provided
HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH