Scrub typhus cases in a family

Abstract is not required for Clinical Images (This page in not part of the published article.) International Journal of Case Reports and Images, Vol. 7 No. 9, September 2016. ISSN – [0976-3198] Int J Case Rep Images 2016;7(9):618–621. www.ijcasereportsandimages.com Taooka et al. 618 CASE REPORT OPEN ACCESS Scrub typhus cases in a family Yasuyuki Taooka, Gen Takezawa


Case 2
Five days after onset of Case 1, 64-year-old female, wife of patient in Case 1, came to our hospital complaining of similar symptoms, which were fever elevation and general malaise for two days. On her physical examination, cervical lymphadenopathy and pharyngitis were recognized. On her lower abdominal lesion, a 8 mm of diameter of localized necrotic lesion was also found ( Figure 2), but maculopapular rash was not found on her trunk and extremities just like her husband. Her blood examination showed as following (Table); LDH 387 IU/L ALT 45 IU/L, AST 62 IU/L, and CRP 1.6 mg/dL, white blood cell count 4,490/mL. On her peripheral blood, 3% of atypical lymphocytes were also observed. They were similar with the results of (Case 1). She worked as a house-wife, and did not work in the endemic field like her husband. DNA analysis as PCR by using sample of her localized-necrotic skin lesion showed positive for Orientia tsutsugamushi, Kuroki. The diagnosis of her having scrub typhus (Tsutsugamushi disease) was performed, and oral administration of minocycline (200 mg/day) was started. Her symptoms relived three days later.

DISCUSSION
Scrub typhus is a kind of mite-transmitted infectious diseases, and occurs in mainly endemic rural areas [1][2][3]. Orientia tsutsugamushi is widely distributed through the Asia-Western Pacific region [1]. Fever, skin eruption, lymphadenopathy, and eschar (localized necrotic lesion) at the site of the chigger bite are known as the specific findings for the diagnosis [2][3][4][5]. The incubation period is around two weeks, and sometimes occurs as imported disease in tourists [2,3]. Therefore, physicians working other than Asia-Western Pacific region also should be aware of its clinical features. Rare but some, since the prognosis of the patients might be mortal [5, 6], Tsutsugamushi diseased need early diagnosis and starting antibiotics including minocycline [4]. The standard regimen is tetracycline (minocycline or doxycycline), and alternatives is chloramphenicol, rifampicin, azithromycin, or clarithromycin [1,4,6]. Usually measuring serum antibody titer against Orientia tsutsugamushi is utilized for the diagnosis [2], but sometimes that might need the days. By using patient's blood or eschar, PCR analysis detecting Orientia tsutsugamushi DNA is useful for having diagnosis [7,8]. According to the previous reports, sensitivity of detecting Orientia tsutsugamushi by PCR analysis using whole blood was more than 82%, and specificity was almost 100% [8]. More than half of scrub typhus patients, atypical erythematous rash is seen several days later after onset of fever elevation [2,3,9]. Same with (Case 2), atypical erythematous rash was not recognized. One possible reason was that early diagnosis was performed by PCR before showing her eruption in (Case 2). The transmission pathway of scrub typhus in (Case 1) might be by contacting with Orientia tsutsugamushi in the forest during the work, but that of (Case 2) was uncertain. Since she has not been to the same forest, another transmission

CONCLUSION
Familial infected case of scrub typhus was reported. PCR analysis was valuable for its diagnosis.

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