Department of Microbiology and Immunology, Faculty of Medical Sciences and The National Institute of Biotechnology in the Negev, Ben Gurion University, Beer Sheva, Israel.|Department of Microbiology and Immunology, Faculty of Medical Sciences and The National Institute of Biotechnology in the Negev, Ben Gurion University, Beer Sheva, Israel.|Department of Microbiology and Immunology, Faculty of Medical Sciences and The National Institute of Biotechnology in the Negev, Ben Gurion University, Beer Sheva, Israel.