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Scrub typhus, a widely endemic disease in Asian Pacific regions, is caused by Orientia tsutsugamushi, a gram-negative obligate intracellular bacterium in the family Rickettsiaceae. When the rickettsia is transmitted to a human through the bite of an infected mite, it begins to multiply at the bite site, and a characteristic skin lesion known as an eschar is formed. The pathogen then spreads systemically by the hematogenous and lymphogenous routes. Various clinical manifestations develop, including fever, rash, and lymphadenopathy .
Before 1986, scrub typhus was only found in southern China (south of the Yangtze River) primarily in the summer. O. tsutsugamushi, which causes "summer-type scrub typhus," is highly virulent and usually transmitted by the Leptotrombidium deliense mite. In 1986, scrub typhus was first reported in Mengyin County, Shandong Province, north of the Yangtze River. This newly recognized "autumn-winter type scrub typhus" is caused by a less virulent strain of O. tsutsugamushi and transmitted by the L. scutellare mite . Since then, cases of autumn-winter scrub typhus have been increasingly reported in many northern areas of China; eschars developed in 82%–91% of those infected .
Traditionally, the diagnosis of scrub typhus mainly relied on serologic tests. The disease could be retrospectively diagnosed in cases of seroconversion or a >4-fold rise in antibody titers between acute-phase and convalescent-phase serum specimens. The requirement of double serum specimens has limited its usage for diagnosis. Recently a polymerase chain reaction (PCR) assay was developed for detecting O. tsutsugamushi Sta56 gene in blood samples or isolates from patients . However, the test often gave a false-negative result because hemoglobin and other components in blood may inhibit PCR amplification The commonly seen eschars in scrub typhus patients were suggested as alternative specimens for diagnosis
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So-so.Don't be so sure.Cisco
So-so.Don't be so sure.Cisco 642-383 You mind your business and I'll mind mine. Don't be a stranger.642-456 P4S If you have something to say…say it.350-001 I can't take it (anymore) .
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Orientia tsutsugamushi in Eschars from Scrub Typhus Patients
Scrub typhus, a widely endemic disease in Asian Pacific regions, is caused by Orientia tsutsugamushi, a gram-negative obligate intracellular bacterium in the family Rickettsiaceae. When the rickettsia is transmitted to a human through the bite of an infected mite, it begins to multiply at the bite site, and a characteristic skin lesion known as an eschar is formed. The pathogen then spreads systemically by the hematogenous and lymphogenous routes. Various clinical manifestations develop, including fever, rash, and lymphadenopathy .
Before 1986, scrub typhus was only found in southern China (south of the Yangtze River) primarily in the summer. O. tsutsugamushi, which causes "summer-type scrub typhus," is highly virulent and usually transmitted by the Leptotrombidium deliense mite. In 1986, scrub typhus was first reported in Mengyin County, Shandong Province, north of the Yangtze River. This newly recognized "autumn-winter type scrub typhus" is caused by a less virulent strain of O. tsutsugamushi and transmitted by the L. scutellare mite . Since then, cases of autumn-winter scrub typhus have been increasingly reported in many northern areas of China; eschars developed in 82%–91% of those infected .
Traditionally, the diagnosis of scrub typhus mainly relied on serologic tests. The disease could be retrospectively diagnosed in cases of seroconversion or a >4-fold rise in antibody titers between acute-phase and convalescent-phase serum specimens. The requirement of double serum specimens has limited its usage for diagnosis. Recently a polymerase chain reaction (PCR) assay was developed for detecting O. tsutsugamushi Sta56 gene in blood samples or isolates from patients . However, the test often gave a false-negative result because hemoglobin and other components in blood may inhibit PCR amplification The commonly seen eschars in scrub typhus patients were suggested as alternative specimens for diagnosis