Epidemiological Characteristics of Severe Fever with Thrombocytopenia Syndrome

Sakarn Charoensakulchai Thai Travel Clinic, Hospital for Tropical Diseases, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand;

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Keita Matsuno Division of Risk Analysis and Management, International Institute for Zoonosis Control, Hokkaido University, Sapporo, Japan;
One Health Research Center, Hokkaido University, Sapporo, Japan;
Institute for Vaccine Research and Development, HU-IVReD, Hokkaido University, Sapporo, Japan;
International Collaboration Unit, International Institute for Zoonosis Control, Hokkaido University, Sapporo, Japan;

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Emi E. Nakayama Center for Infectious Disease Education and Research, Department of Viral Infections, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan;

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Tatsuo Shioda Center for Infectious Disease Education and Research, Department of Viral Infections, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan;

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Hisham A. Imad Thai Travel Clinic, Hospital for Tropical Diseases, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand;
Center for Infectious Disease Education and Research, Department of Viral Infections, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan;
Department of Clinical Tropical Medicine, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand

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Severe fever with thrombocytopenia syndrome (SFTS) is an emerging infectious disease primarily reported in Asia. This review aims to summarize studies on the epidemiological characteristics of SFTS. Literature from PubMed and Scopus was searched up to February 14, 2024. A total of 76 articles were eligible. Infections were reported in China, Japan, South Korea, and several other countries in Asia. The incidence of SFTS has been rising and reported from new areas across Asia. The incidence rate was highest in China, ranging from fewer than 0.1 to 4.2 cases per 100,000 population and reaching up to 127.6 cases per 100,000 population in some areas. Most cases occurred between April and December. Elderly farmers and veterinarians were the most affected group. Key epidemiological factors included direct contact with animals, outdoor work, vegetation near homes, rural or hilly residency, tick bites, and direct contact with blood or saliva from infected animals or humans.

Author Notes

Authors’ contributions: S. Charoensakulchai and H. A. Imad conceptualized the study. S. Charoensakulchai and H. A. Imad provided the methodology. S. Charoensakulchai and H. A. Imad wrote the original draft. S. Charoensakulchai, K. Matsuno, E. E. Nakayama, T. Shioda, and H. A. Imad reviewed and edited the manuscript. S. Charoensakulchai, K. Matsuno, E. E. Nakayama, T. Shioda, and H. A. Imad read and agreed to the final version of this manuscript.

Current contact information: Sakarn Charoensakulchai, Thai Travel Clinic, Hospital for Tropical Diseases, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand, E-mail: sakarn.cha@mahidol.ac.th. Keita Matsuno, Division of Risk Analysis and Management, International Institute for Zoonosis Control, Hokkaido University, Sapporo, Japan, E-mail: matsuk@czc.hokudai.ac.jp. Emi E. Nakayama and Tatsuo Shioda, Center for Infectious Disease Education and Research, Department of Viral Infections, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan, E-mails: emien@biken.osaka-u.ac.jp and shioda@biken.osaka-u.ac.jp. Hisham A. Imad, Department of Clinical Tropical Medicine, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand, E-mail: hishamahmed.ima@mahidol.ac.th.

Address correspondence to Hisham A. Imad, Department of Clinical Tropical Medicine, Faculty of Tropical Medicine, Mahidol University, 420/6 Ratchawithi Rd., Bangkok 10400, Thailand. E-mail: hishamahmed.ima@mahidol.ac.th
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