The collection surface of the swab thus maintains {HEAD ~ contact} with {TAIL ~ the rehydrated media plug} 
The collection surface of the swab thus maintains { HEAD ~ contact } with { TAIL ~ the rehydrated media plug }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL