1. Department of Epidemiology and Preventive Medicine, School of Public Health, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, 69978, Israel;
2. Laboratory of Environmental Virology, Central Virology Laboratory, Sheba Medical Center Public Health Services, Israel Ministry of Health, Tel Hashomer, 52621, Israel
3. Division of Avian Diseases, Kimron Veterinary Institute, Bet Dagan, 50250, Israel;