It further describes {HEAD ~ recombinant viruses} derived from {TAIL ~ this virus} and the use of the virus or its recombinants as a medicament or vaccine 
derived from
It further describes { HEAD ~ recombinant viruses } derived from { TAIL ~ this virus } and the use of the virus or its recombinants as a medicament or vaccine
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH