viruses Article Human Coronavirus Infections in Israel: Epidemiology, Clinical Symptoms and Summer Seasonality of HCoV-HKU1 Nehemya Friedman 1,2, Hadar Alter 1, Musa Hindiyeh 1,2, Ella Mendelson 1,2, Yonat Shemer Avni 3 and Michal Mandelboim 1,2,* 1 Central Virology Laboratory, Ministry of Health, Chaim Sheba Medical Center, Tel-Hashomer, P.O.B. 5265601, Ramat-Gan 5290002, Israel;