Abbreviations. SS-stunting syndrome, SSA-stunting syndrome agent, PGRpolymerase chain reaction, RT-PCR-reverse transcription-polymerase chain reaction, EUSA-enzyme linked immunosorbant assay, IBV • Infectious bronchitis virus, NDV-Newcastle disease virus, Al « avian influenza, BCV « bovine coronavirus, TGEV-transmissible gastroenteritis virus, SVN-serum virus neutralization, DAB-EUSA-dot immunobinding Avidin-Blotin enhanced EUSA.