Severe fever with thrombocytopenia syndrome
Also identified by the WHO as "serious," severe fever with thrombocytopenia syndrome (also known as thrombocytopenia) is an emerging disease found in China, Japan and South Korea. The virus appears to be spread by ticks, reports UpToDate.
The main symptom is a very high fever, as well as a drop in blood platelets that causes tissue bleeding, bruising and slow blood clotting. According to a recent CDC study, the fatality rate for SFTS in South Korea was 47.2%. Currently there is no treatment or vaccine available.