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Bao, Chang-jun; Guo, Xi-ling; Qi, Xian; Hu, Jian-li; Zhou, Ming-hao; Varma, Jay K.; Cui, Lun-biao; Yang, Hai-tao; Jiao, Yong-jun; Klena, John D.; Li, Lu-xun; Tao, Wen-yuan; Li, Xian; Chen, Yin; Zhu, Zheng; Xu, Ke; Shen, Ai-hua; Wu, Tao; Peng, Hai-yan; Li, Zhi-feng; Shan, Jun; Shi, Zhi-yang; Wang, Hua
Clinical infectious diseases, 12/2011, Volume: 53, Issue: 12Journal Article
Background. Seven persons in one family living in eastern China developed fever and thrombocytopenia during May 2007, but the initial investigation failed to identify an infectious etiology. In December 2009, a novel bunyavirus (designated severe fever with thrombocytopenia syndrome bunyavirus SFTSV) was identified as the cause of illness in patients with similar clinical manifestations in China. We reexamined this family cluster for SFTSV infection. Methods. We analyzed epidemiological and clinical data for the index patient and 6 secondary patients. We tested stored blood specimens from the 6 secondary patients using real time reverse transcription polymerase chain reaction (RT-PCR), viral culture, genetic sequencing, micro-neutralization assay (MNA), and indirect immunofluorescence assay (IFA). Results. An 80-year-old woman with fever, leucopenia, and thrombocytopenia died on 27 April 2007. Between 3 and 7 May 2007, another 6 patients from her family were admitted to a local county hospital with fever and other similar symptoms. Serum specimens collected in 2007 from these 6 patients were positive for SFTS viral RNA through RT-PCR and for antibody to SFTSV through MNA and IFA. SFTSV was isolated from 1 preserved serum specimen. The only shared characteristic between secondary patients was personal contact with the index patient; none reported exposure to suspected animals or vectors. Conclusions. Clinical and laboratory evidence confirmed that the patients of fever and thrombocytopenia occurring in a family cluster in eastern China in 2007 were caused by a newly recognized bunyavirus, SFTSV. Epidemiological investigation strongly suggests that infection of secondary patients was transmitted to family members by personal contact.
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