Fig. 1

Timeline of disease onset dates for a cluster of 18 SFTS (severe fever with thrombocytopenia syndrome) patients. Epidemic curve shows progression of critical symptoms during the index patient’s illness, and the onset of SFTS in the eight clustered patients, of which the onset date ranged from 5 to 11 days after exposure to the dead body of the index patient, and clinical incubation time was mostly focused on 9 days (n = 17)