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. 2014:2014:918135.
doi: 10.1155/2014/918135. Epub 2014 Dec 4.

Mild clinical course of severe Fever with thrombocytopenia syndrome virus infection in an elderly Japanese patient

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Mild clinical course of severe Fever with thrombocytopenia syndrome virus infection in an elderly Japanese patient

Yuko Ohagi et al. Case Rep Infect Dis. 2014.

Abstract

Severe fever with thrombocytopenia syndrome (SFTS) is an emerging infectious and hemorrhagic disease recently described in China and western Japan. A 71-year-old healthy Japanese woman noticed a tick biting her after harvesting in an orchard and removed it herself. She developed diarrhea, anorexia, and chills eight days later. Because these symptoms continued, she visited a primary care physician 6 days after the onset. Laboratory data revealed thrombocytopenia, leukocytopenia, and elevated liver enzymes. She was then referred to our hospital. Although not completely fulfilling the diagnostic criteria used in a retrospective study in Japan, SFTS was suspected, and we detected SFTS virus in the patient's blood using RT-PCR. However, she recovered without intensive treatment and severe complications 13 days after the onset. In this report, we present a mild clinical course of SFTS virus infection in Japan in detail.

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Figures

Figure 1
Figure 1
Clinical signs of an elderly patient with SFTSV infection. (a) A tick bite was found on the left thigh. (b) Microscopic findings of Giemsa staining of bone marrow showed platelet-specific hemophagocytes. (c) Contrast-enhanced computed tomography showed left inguinal lymphadenopathy alone.
Figure 2
Figure 2
Detection of Japanese SFTSV mRNA using a conventional one-step RT-PCR method. Clinical specimen by RT-PCR: lane 1: our patient's blood sample; lane 2: negative control (NTC); lane 3: positive control (PC) (SFTSV strain HB29 viral RNA). Primer sets numbers 1 and 2 amplified the gene coding SFTSV NP, and the sizes of these products were 458 bp and 461 bp, respectively.

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