This study was conducted to shed light on the role of bacteria in inducing and/or aggravating psoriasis. Staph. aureus was the major bacterial species that was reported singly from psoriatic lesions.The enterotoxigenicity of Staph. aureus that was isolated from psoriatic lesions is detected for the first time in Iraq. Such detection is made to clarify the role of these enterotoxigenic Staph. aureus in the pathogenesis of psoriasis. An In Vivo attempt to induce psoriatic skin lesions with BALB/C mice was performed. The current study has confirmed an increase in the mean percentages of studied...