Absence of Crimean-Congo haemorrhagic fever virus in the tick Hyalomma aegyptium parasitizing the spur-thighed tortoise (Testudo graeca) in Tunisia oleh Fares Wasfi, Dachraoui Khalil, Najjar Chawki, Younsi Hend, Findlay-Wilson Stephen, Petretto Marie, Dowall Stuart, Hewson Roger, Zhioua Elyes