1. Al-Quds Nutrition and Health Research Institute, Faculty of Medicine, Al-Quds University, Abu-Deis, P.O. Box 201760, West Bank, Palestine
2. the Koret School of Veterinary Medicine, the Hebrew University of Jerusalem, Rehovot, Israel
3. Department of Microbiology and Molecular Genetics, the Hebrew University-Hadassah Medical School, Jerusalem, Israel
4. Department of Infection, University College London, London, United Kingdom