supported by grants from the National Basic Research Program of China (973 Program,2005CB523200);the National High-Tech Research and Development Program of China (863 Program,2006AA10A20 4);the National Key Technology R&D Program (2006BAD 06A04/18/01/03);the National Natural Science Foundation of China (30470072)
Since May 2006,a highly pathogenic porcine reproductive and respiratory syndrome virus (HP-PRRSV) variant characterized by 30 amino acids deletion within its NSP2-coding region emerged and caused extensive economic ...