We generate two chimeric viruses with the 3A region of O/HKN/21/70.
The chimeric viruses stably maintained the foreign gene after passage in BHK-21 cells.
The 3A region was not the only genetic determinant affecting FMDV replication in FBK cells.
FMDV genome sequence outside the 3A region also affect FMDV replication in FBK cells.