AMANI F. ABAZA1, SORAYA A. EL SHAZLY1, HEBA S. A. SELIM1 and GEHAN S. A. ALY2 1Microbiology Department, High Institute of Public Health, Alexandria University, Alexandria, Egypt 2Alexandria University Students' Hospital, Alexandria, Egypt *Corresponding author: A.F. Abaza, Microbiology Department, High Institute of Public Health, Alexandria University, Egypt; e-mail: amani_a...