al-Sabawi, R. “Study of Some Virulence Factors of Salmonella Typhi Pseudomonas Aeruginosa, Micrococcus Luteus and Staphylococcus Aureus”. Journal of Education and Science (JES), vol. 25, no. 3, Sept. 2012, pp. 13-24, doi:10.33899/edusj.2012.59208.