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Scrub typhus

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https://www.readbyqxmd.com/read/29313468/molecular-epidemiology-of-an-orientia-tsutsugamushi-gene-encoding-a-56-kda-type-specific-antigen-in-chiggers-small-mammals-and-patients-from-the-southwest-region-of-korea
#1
Jung Wook Park, Sun Hee Kim, Duck Woong Park, So Hyang Jung, Hye Jung Park, Mi Hee Seo, Hyeon Je Song, Jung Yoon Lee, Dong Min Kim, Choon Mi Kim, Byong Chul Gill, Hang Jin Jeong, Jeong Min Lee, Dong Ryong Ha, Eun Sun Kim, Jae Keun Chung
A phylogenetic analysis of Orientia tsutsugamushi was performed to elucidate its antigenic diversity in chiggers, small mammals, and patients. Between September 2014 and December 2016, a total of 3,816 chiggers were identified within nine species of four genera in the southwest region of Korea: Leptotrombidium scutellare (49.9%; 1,907/3,816), Leptotrombidium orientale (21.1%; 804/3,816), Leptotrombidium pallidum (12.4%; 474/3,816), Euchoengastia koreaensis (7.2%; 273/3,816), Leptotrombidium palpale (6.7%; 256/3,816), Neotrombicular gardellai (1...
January 8, 2018: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29259327/longevity-of-antibody-and-t-cell-responses-against-outer-membrane-antigens-of-orientia-tsutsugamushi-in-scrub-typhus-patients
#2
Na-Young Ha, Yuri Kim, Chan-Ki Min, Hong-Il Kim, Nguyen Thi Hai Yen, Myung-Sik Choi, Jae-Seung Kang, Yeon-Sook Kim, Nam-Hyuk Cho
Scrub typhus, caused by Orientia tsutsugamushi infection, has been a serious public health issue in the Asia-Pacific region, with rising incidence and sporadic outbreaks. However, human protective immunity against specific antigens has been poorly characterized for this bacterium. In addition, immunity produced in early vaccine trials or even after natural infections, did not last long and had poor cross-reactivity among various genotypes. Here, we systematically investigated the kinetics and magnitude of specific adaptive immunity against two membrane antigens, 56 kDa type-specific antigen (TSA56) and surface cell antigen A (ScaA), that are involved in bacterial adhesion and invasion of the host in 64 recovered scrub typhus patients...
December 20, 2017: Emerging Microbes & Infections
https://www.readbyqxmd.com/read/29217880/renal-manifestation-in-scrub-typhus-during-a-major-outbreak-in-central-nepal
#3
A Sedhain, G R Bhattarai
Renal involvement and acute kidney injury (AKI) are common clinical manifestations seen in scrub typhus, a vector-borne tropical disease. There are no data on renal manifestation in scrub typhus in Nepal. We conducted a prospective study to analyze the incidence, urinary abnormalities, course, severity, outcome, and the predictors of AKI in patients with scrub typhus during a major outbreak in Central Nepal. Total 1398 patients admitted with acute febrile illness were subjected for Scrub Typhus Detect™ Immunoglobulin M (IgM) enzyme-linked immunosorbent assay (ELISA) test, of which 502 (35...
November 2017: Indian Journal of Nephrology
https://www.readbyqxmd.com/read/29208659/rapid-diagnosis-of-tick-borne-illnesses-by-use-of-one-step-isothermal-nucleic-acid-amplification-and-bio-optical-sensor-detection
#4
Ji Yeun Kim, Bonhan Koo, ChoongEun Jin, Min Chul Kim, Yong Pil Chong, Sang-Oh Lee, Sang-Ho Choi, Yang Soo Kim, Jun Hee Woo, Yong Shin, Sung-Han Kim
BACKGROUND: Scrub typhus and severe fever with thrombocytopenia syndrome (SFTS) are the most common tick-borne illnesses in South Korea. Early differentiation of SFTS from scrub typhus in emergency departments is essential but difficult because of their overlapping epidemiology, shared risk factors, and similar clinical manifestations. METHODS: We compared the diagnostic performance of one-step isothermal nucleic acid amplification with bio-optical sensor detection (iNAD) under isothermal conditions, which is rapid (20-30 min), with that of real-time PCR, in patients with a confirmed tick-borne illness...
December 5, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/29207762/guillain-barre-syndrome-with-falciparum-malaria-and-scrub-typhus-mixed-infection-an-unusual-combination
#5
Rahul Sai Gangula, Weena Stanley, Arunsheshu Vandanapu, M Mukhyaprana Prabhu
Guillain-Barre Syndrome is very rare in parasitic and rickettsial infection. Here we report a case of Plasmodium falciparum and scrub typhus mixed infection, presented with quadriparesis. Clinical, Serological, CSF analysis and Nerve Conduction Studies were consistent with Acute Inflammatory Demyelinating Polyneuropathy (variant of GBS). After administration of antimalarials and antibiotics for the mixed infection, patient gradually improved.
September 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/29176880/seroprevalence-of-rickettsial-infections-and-q-fever-in-bhutan
#6
Tshokey Tshokey, John Stenos, David N Durrheim, Keith Eastwood, Chelsea Nguyen, Stephen R Graves
BACKGROUND: With few studies conducted to date, very little is known about the epidemiology of rickettsioses in Bhutan. Due to two previous outbreaks and increasing clinical cases, scrub typhus is better recognized than other rickettsial infections and Q fever. METHODOLOGY: A descriptive cross-sectional serosurvey was conducted from January to March 2015 in eight districts of Bhutan. Participants were 864 healthy individuals from an urban (30%) and a rural (70%) sampling unit in each of the eight districts...
November 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29173047/epidemiological-clinical-and-laboratory-profile-of-scrub-typhus-cases-detected-by-serology-and-rt-pcr-in-kumaon-uttarakhand-a-hospital-based-study
#7
Vinita Rawat, Rajesh Kumar Singh, Ashok Kumar, Sandip R Saxena, Umesh Varshney, Mukesh Kumar
We analysed the epidemiology, clinical and laboratory data of the 168 scrub typhus cases confirmed by a combination of any one of the following: real time polymerase chain reaction (RT-PCR) and/or immunofluorescence assay (IFA) (IgM and/or IgG). The peak season for scrub typhus is from July to October. By multivariate binary logistic regression analysis, the risk of scrub typhus was about four times in those working in occupation related to forest work. Major clinical manifestations were fever (100%), myalgia (65%), cough (51%) and vomiting (46%); major complications were meningitis/meningoencephatilitis (12...
January 1, 2017: Tropical Doctor
https://www.readbyqxmd.com/read/29137528/scrub-typhus-reinfection
#8
Munegowda C Koralur, Rahul Singh, Muralidhar Varma, John Stenos, Indira Bairy
No abstract text is available yet for this article.
January 1, 2017: Tropical Doctor
https://www.readbyqxmd.com/read/29121711/differences-in-agricultural-activities-related-to-incidence-of-scrub-typhus-between-korea-and-japan
#9
Gyung-Jae Oh, Chang-Jin Ma, Gong-Unn Kang, Jeong-Mi Lee, Da-Un Lee, Hae-Sung Nam, So-Yeon Ryu, Young-Hoon Lee
Objectives: The purpose of this study is to establish a basis for improving or strengthening the preventive strategy against scrub typhus in Korea by comparing and analyzing the difference of prevention behaviors contributing to the occurrence of scrub typhus in both countries. Methods: The survey area selected Jeonbuk province, which is a high risk and high incidence area, and Fukuoka prefecture, which is a high risk and low incidence area. The subjects were 406 in Korea and 216 in Japanese farmers...
November 9, 2017: Epidemiology and Health
https://www.readbyqxmd.com/read/29109174/orientia-tsutsugamushi-modulates-endoplasmic-reticulum-associated-degradation-to-benefit-its-growth
#10
Kyle G Rodino, Lauren VieBrock, Sean M Evans, Hong Ge, Allen L Richards, Jason A Carlyon
Orientia tsutsugamushi, an obligate intracellular bacterium that is auxotrophic for the aromatic amino acids and histidine, causes scrub typhus, a potentially deadly infection that threatens one billion people. O. tsutsugamushi growth is minimal during the first 24 to 48 h of infection, but becomes logarithmic thereafter. How the pathogen modulates cellular functions to support its growth is poorly understood. The unfolded protein response (UPR) is a cytoprotective pathway that relieves endoplasmic reticulum (ER) stress by promoting ER-associated degradation (ERAD) of misfolded proteins...
November 6, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/29103271/chigger-mite-acari-trombiculidae-survey-of-rodents-in-shandong-province-northern-china
#11
Xiao-Dan Huang, Peng Cheng, Yu-Qiang Zhao, Wen-Juan Li, Jiu-Xu Zhao, Hong-Mei Liu, Jing-Xuan Kou, Mao-Qing Gong
Chigger mites are parasites of rodents and other vertebrates, invertebrates, and other arthropods, and are the only vectors of scrub typhus, in addition to other zoonoses. Therefore, investigating their distribution, diversity, and seasonal abundance is important for public health. Rodent surveillance was conducted at 6 districts in Shandong Province, northern China (114-112°E, 34-38°N), from January to December 2011. Overall, 225/286 (78.7%) rodents captured were infested with chigger mites. A total of 451 chigger mites were identified as belonging to 5 most commonly collected species and 3 genera in 1 family...
October 2017: Korean Journal of Parasitology
https://www.readbyqxmd.com/read/29099844/a-review-of-the-global-epidemiology-of-scrub-typhus
#12
REVIEW
Guang Xu, David H Walker, Daniel Jupiter, Peter C Melby, Christine M Arcari
Scrub typhus is a serious public health problem in the Asia-Pacific area. It threatens one billion people globally, and causes illness in one million people each year. Caused by Orientia tsutsugamushi, scrub typhus can result in severe multiorgan failure with a case fatality rate up to 70% without appropriate treatment. The antigenic heterogeneity of O. tsutsugamushi precludes generic immunity and allows reinfection. As a neglected disease, there is still a large gap in our knowledge of the disease, as evidenced by the sporadic epidemiologic data and other related public health information regarding scrub typhus in its endemic areas...
November 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29078126/differential-diagnosis-of-scrub-typhus-meningitis-from-tuberculous-meningitis-using-clinical-and-laboratory-features
#13
Ashraf V Valappil, Sohanlal Thiruvoth, Jabir M Peedikayil, Praveenkumar Raghunath, Manojan Thekkedath
OBJECTIVES: The involvement of the central nervous system in the form of meningitis or meningoencephalitis is common in scrub typhus and is an important differential diagnosis of other lymphocytic meningitis like tuberculous meningitis (TBM). The aim of this study was to identify the clinical and laboratory parameters that may be helpful in differentiating scrub typhus meningitis from TBM. PATIENTS AND METHODS: We compared of the clinical and laboratory features of 57 patients admitted with scrub typhus meningitis or TBM during a 3-year period...
December 2017: Clinical Neurology and Neurosurgery
https://www.readbyqxmd.com/read/29016300/relative-bradycardia-in-scrub-typhus
#14
Lae Young Jung, Mir Jeon, Seung Hee Choi, Joo-Hee Hwang, Chang-Seop Lee, Kyoung-Suk Rhee
To investigate the relationship between heart rate and temperature, we examined 493 febrile patients with documented disease. These patients were diagnosed serologically and analyzed retrospectively: 337 (68.4%) responded to fever with increased heart rate < 10 beats/minute/°C (relative bradycardia [RB]), and 156 patients had a heart rate response ≥ 10 beats/minute/°C (general heart rate increase [GHRI]). The RB group had a higher median resting heart rate and lower heart rate at maximum temperature than the GHRI group...
September 25, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28985768/immune-thrombocytopenia-with-multi-organ-dysfunction-syndrome-as-a-rare-presentation-of-scrub-typhus-a-case-report
#15
Abraham M Ittyachen, Saramma P Abraham, Smitha Krishnamoorthy, Anuroopa Vijayan, Jayamohan Kokkat
BACKGROUND: Scrub typhus is an acute infectious illness caused by Orientia tsutsugamushi. It is endemic to a part of the world known as the "tsutsugamushi triangle". Humans are accidental hosts in this zoonotic disease. About a third of patients admitted with scrub typhus have evidence of multi-organ dysfunction. Multi-organ dysfunction secondary to scrub typhus carries a high mortality rate. CASE PRESENTATION: We report a 65-year old lady who was admitted in a Tertiary Care Center in the state of Kerala in India, with 7 day history of fever, myalgia and reduced urine output...
October 6, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28981880/new-record-of-the-scrub-typhus-vector-leptotrombidium-rubellum-in-southwest-china
#16
Pei Y Peng, Xian G Guo, Dao C Jin, Wen G Dong, Ti J Qian, Feng Qin, Zhi H Yang
There are several main vectors of scrub typhus in China, and Leptotrombidium rubellum Wang et Liao, 1984 is one of them, which was previously considered to be restricted to the coastal regions of Changle to Xiamen, Fujian province of east China. Ecological investigation of chigger mites in recent years demonstrated the presence of L. rubellum also in Yunnan province. Chigger mites were collected from 34 counties, in which 127,460 larval mites were collected from 14,381 small mammal hosts. A total of 277 species belonging to 26 genera and three subfamilies were identified...
November 7, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/28979015/scrub-typhus-in-southern-districts-of-west-bengal
#17
Nilendu Sarma, Sayantani Chakraborty
Scrub typhus has been previously reported from north and eastern Indian states and areas such as Kashmir, Himachal Pradesh, Assam, Sikkim, and Darjeeling district of West Bengal. It has also been known to be endemic in some parts of South India (Eastern and Western Ghats). However, no cases have ever been reported from the southern districts of West Bengal. Here, we report five cases of scrub typhus from South 24 Parganas and Kolkata, two districts in the southern part of West Bengal, India.
September 2017: Indian Journal of Dermatology
https://www.readbyqxmd.com/read/28979009/scrub-typhus-an-emerging-threat
#18
Sayantani Chakraborty, Nilendu Sarma
Scrub typhus is caused by Orientia tsutsugamushi (formerly Rickettsia) and is transmitted to humans by an arthropod vector of the Trombiculidae family (Leptotrombidium deliense and L. akamushi). It is the most common re-emerging Rickettsial infection in India and many other South East Asian countries. In fact, scrub typhus is confined geographically to the Asia Pacific region, a billion people are at risk and nearly a million cases are reported every year. Scrub typhus appears particularly to be distributed in the tsutsugamushi triangle which is distributed over a very wide area of 13 million km(2) bound by Japan in the east, through China, the Philippines, tropical Australia in the south, and west through India, Pakistan, possibly to Tibet to Afghanistan, and southern parts of the USSR in the north...
September 2017: Indian Journal of Dermatology
https://www.readbyqxmd.com/read/28978319/acute-undifferentiated-fever-in-india-a-multicentre-study-of-aetiology-and-diagnostic-accuracy
#19
Kristine Mørch, Anand Manoharan, Sara Chandy, Novin Chacko, Gerardo Alvarez-Uria, Suvarna Patil, Anil Henry, Joel Nesaraj, Cijoy Kuriakose, Ashita Singh, Siby Kurian, Christel Gill Haanshuus, Nina Langeland, Bjørn Blomberg, George Vasanthan Antony, Dilip Mathai
BACKGROUND: The objectives of this study were to determine the proportion of malaria, bacteraemia, scrub typhus, leptospirosis, chikungunya and dengue among hospitalized patients with acute undifferentiated fever in India, and to describe the performance of standard diagnostic methods. METHODS: During April 2011-November 2012, 1564 patients aged ≥5 years with febrile illness for 2-14 days were consecutively included in an observational study at seven community hospitals in six states in India...
October 4, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28969232/scrub-typhus-in-a-new-born
#20
Mamta Jajoo, Dipti Kumar, Sameeksha Manchanda
Scrub typhus is an acute febrile mite-born rickettsial infection caused by Orientia tsutsugamushi (formely called Rickettsiatsutsugamushi). This infection is very uncommon in neonates. We report a case of 19-day-old newborn presenting with clinical features mimicking severe sepsis but was subsequently diagnosed with primary scrub typhus infection. The timely treatment resulted in dramatic response and complete recovery.
August 2017: Journal of Clinical and Diagnostic Research: JCDR
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