Fig. 2

A Transmission routes for one SFTS cluster in Anji County, Zhejiang Province, 2014. B Transmission routes for one SFTS cluster in Hanshan County, Anhui Province, 2020. A Patient A was the index patient and died of massive bleeding while being transferred from hospital to home. The patient had infected 11 secondary patients (Patient B–Patient L); among them, nine patients were infected by blood contact while the other two patients were infected through inhalation of Brucella-containing aerosol in a confined mourning room, without direct contact with the patient or other possible exposure. All the secondary patients did not wear personal protection equipment during the exposure. The index patient had been exposed to a tick bite while picking tea leaves on the tea garden. The serum positive detection rates of SFTSV IgG were 1.6% and 2.0% in healthy people and ducks, respectively, living in the village where the index patient lived. B The index patient (A) was a 51-year-old male farmer who was infected through contact with the blood of a dead dog that had been bitten by ticks. He had infected seven secondary cases. Specifically, five family members and relatives were infected through blood contact while a nurse and a doctor were infected through non-blood contact. SFTS severe fever with thrombocytopenia syndrome, SFTSV severe fever with thrombocytopenia syndrome virus