Bacteriological profile, antimicrobial susceptibility patterns of the isolates among street vended foods and hygienic practice of vendors in Gondar town, Northwest Ethiopia: a cross sectional study

埃塞俄比亚西北部贡德尔镇街头食品摊贩分离菌株的细菌学特征、抗菌药物敏感性模式及摊贩卫生习惯：一项横断面研究