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자료유형
학술저널
저자정보
저널정보
대한감염학회 Infection and Chemotherapy Infection and Chemotherapy 제40권 제4호
발행연도
2008.1
수록면
212 - 217 (6page)

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Background : Scrub typhus, an infectious disease caused by Orientia tsutsugamushi, is endemic in Korea. With the introduction of tetracycline and chloramphenicol in clinical practice, the mortality due to scrub typhus has markedly decreased. In 1995, scrub typhus poorly responsive to doxycycline was reported in Thailand; the need for safe antibiotics for the treatment of scrub typhus acquired during pregnancy or for children is emerging; also, broader spectrum antibiotics having anti-Orientia activity may be preferred for empirical therapy of enteric fever syndrome and for complicated scrub typhus. The anti-Orientia activities of various antibiotics, including recently licensed antibiotics, were investigated by flow cytometry. Materials and Methods : O. tsutsugamushi strain Boryong was inoculated into the ECV304 cell line. The infected cells were stained with FS15, a monoclonal antibody reacting against a linear epitope on 56-kDa major outer membrane protein of O. tsutsugamushi. Then the antimicrobial susceptibilities were measured by flow cytometry and expressed as a growth index (total mass of Orientia). A concentration at which no further decrease in growth index occurred was defined as the minimal inhibitory concentration (MIC). Microbial susceptibilities to the following antibiotics were measured: quinupristin-dalfopristin (Synercid), levofloxacin, ciprofloxacin, moxifloxacin, metronidazole, linezolid, clindamycin, chloramphenicol, doxycycline, azithromycin, and rifampin. Results : Considering the usual serum concentrations of rifampin (MIC=0.025-0.05 µg/mL), azithromycin (MIC=0.05-0.5 µg/mL) and doxycycline (MIC=0.05-0.1 µg/mL), these antibiotics exhibited very low MICs. Synercid (MIC=0.2-1.0 µg/mL), clindamycin (MIC=1.0 µg/mL) and chloramphenicol (MIC=1-2 µg/mL) exhibited moderately low MICs; moxifloxacin (MIC=8 µg/mL), ciprofloxacin (MIC=25.6 µg/mL or more) and levofloxacin (MIC=30 µg/mL) exhibited relatively high MICs; and cefotaxime (MIC>50 µg/mL), metronidazole (MIC>30 µg/mL) and linezolid (>30 µg/mL) exhibited high MICs. Conclusions : Among the new antibiotics, none was superior to doxycycline, azithromycin or rifampin with respect to anti-Orientia activity. Synercid, clindamycin, and moxifloxacin may show moderate therapeutic efficacies in human.

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