An emerging infectious disease with unknown agent noted through 2009 in China,it characters majorly with severe fever,thrombocytopenia,leukocytopenia,gastrointestinal symptoms and high case fatality rate.The disease has been named severe fever with thrombocytopenia syndrome (SFTS).A novel phlebovirus was isolated from acute patients,ticks and domestic animals and was considered as the causal agent of the disease.