List of Articles virulence genes (CspA Open Access Article Abstract Page Full-Text 1 - Molecular investigation of genes (CspA, CspB and Spb1) of Streptococcus echoes isolated from respiratory samples of horses suffering from acute respiratory infection by multiplex PCR method Ali Shamsizadeh Meymandi mohammad mazrouei sabadni Babak Kheirkhah ehsan stabraghi