A clinical case of falciparum malaria with no history of travel but a recent history of blood transfusion, was reported by Guangdong Provincial Center for Disease Control and Prevention in October 2017.We collected clinical data of the patient and carried out an epidemiological traceability survey.Blood samples were collected from the patient and 20 blood donors for malaria rapid diagnostic tests(RDT), microscopic observation of blood smears, and nested PCR.The positive specimens were traced using molecular...