{TAIL ~ The method} 1, wherein the titer of virus produced by {HEAD ~ the infected cells} is at least 108 TCID50/ml 
{ TAIL ~ The method } 1 , wherein the titer of virus produced by { HEAD ~ the infected cells } is at least 108 TCID50 / ml
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH