الفهرس 
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Abstract
The current study aimed to characterize the phenotypic bacterial causes of respiratory diseases in clinical ,subclinical and carrier horses of different ages and to perform biochemical , serological,virulance and antibiogram tests of isolated bacteria from horses with respiratory diseases.
Total numbers of (250) nasal swabs were collected from into three groups :foregin breed (59), native breed (133) and arabien breed (58).
The main isolate is s.equi subspp.equi recovered from all breedes in an incidance of (13.2%),the others detected bacteria are S.zooepidemicus in an incidance of (8%),R.equi in an incidance of (6.8%),S.aureus in an incidance of (8.4%),S.epidermidis in an incidance of (10%),E.coli in an incidance of (15.2%),K.pneumoniae in an incidance of (5.6%) and P. vulgaris in an incidance of (1.6%).
This study include the virulance assay to all isolated bacteria as Hemolytic activity,Congo red binding activity,Vero cell cytotoxicity and Biofilm formation , in adittion to achieve antibiogram tests to isolated bacteria that shows the Gram +ve bacteria are sensitive to cefoxitin , gentamicin , ciprofloxacin ,azithromycin while they show high resistance for vancomycin, while Gram – ve bacteria are sensitive for imipenem , cefoperazone , aztreonam and ceftriaxone while they show high resistance for gentamicin , cefotaxime.