A defined regimen of media changes are used to establish {TAIL ~ a quiescent and nonproductive state} following the withdrawal of {HEAD ~ the antiviral treatment} 
A defined regimen of media changes are used to establish { TAIL ~ a quiescent and nonproductive state } following the withdrawal of { HEAD ~ the antiviral treatment }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD