Orientia Tsutsugamushi Comb
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
SIP Newsletter 2015 June V4.Pages
Society for Invertebrate Pathology Newsletter Volume 48 Issue 2 June, 2015 Downtown Vancouver at Sunset. Photo Credit: Magnus3D Meeting Events: Saturday Tuesday Registration (2 pm - 8 pm) Concurrent Sessions Sunday Excursions and 5K Race BBQ at the Cheakamus Center SIP Council Meeting OECD Satellite Symposium Wednesday Bacteria Workshop Concurrent Sessions Opening Mixer Posters Monday Division Business Meetings Founders’ Lecture Thursday Plenary Symposium Concurrent Sessions Concurrent Sessions SIP Annual & Student Business Division Business Meetings Meetings Award Ceremonies and Banquet !1 From the President Dear SIP Colleagues, This communiqué is threefold. First, I would like to encourage those of you President who have yet to do so to register for the Peter Krell, Canada 2015 SIP in Vancouver Canada, second, convince those with a flair for Vice President writing to step up to replace Eric Haas Johannes Jehle, Germany Stapleton as SIP Newsletter Editor and Past President third, inform you about our Golden Jørgen Eilenberg, Denmark Jubilee Committee. The 48th SIP meeting is just around Secretary the corner, August 9 to 13, all in the Mary Barbercheck, USA newly opened “The Nest” at the beautiful University of British Treasurer Columbia campus, overlooking the Strait of Georgia between Stefan Jaronski, USA Vancouver and Vancouver Island, and only a short bicycle ride of about 90 miles (150 km) north of Seattle. There are many reasons Trustees to attend, just check out the meeting’s website on the SIP home Surendra Dara, USA Albrecht Koppenhofer, USA page. Famous for its natural beauty with great opportunities for Ed Lewis, USA hiking, canoeing and nature photography, along with both classical Monique van Oers, The Netherlands and aboriginal culture with a mixed east/west cuisine. -
(Scrub Typhus). Incubation Period 1 to 3
TYPHUS Causative Agents TYPHUS Rickettsia typhi (murine typhus) and Orientia tsutsugamushi (scrub typhus). Causative Agents IncubationRickettsia typhi Period (murine typhus) and Orientia tsutsugamushi (scrub typhus). 1 to 3 weeks Incubation Period Infectious1 to 3 weeks Period Zoonoses with no human-to-human transmission. Infectious Period TransmissionZoonoses with no human-to-human transmission. Scrub typhus: Bite of grass mites (larval trombiculid mites) MurineTransmission typhus: Bite of rat fleas (also cat and mice fleas) RodentsScrub typhus: are the Bite preferred of grass and mites normal (larval hosts. trombiculid mites) Murine typhus: Bite of rat fleas (also cat and mice fleas) EpidemiologyRodents are the preferred and normal hosts. Distributed throughout the Asia-Pacific rim and is a common cause of pyrexia of unknownEpidemiology origin throughout SE Asia. Occupational contact with rats (e.g. construDistributedction throughout workers inthe makeAsia-Pshiftacific container rim and isfacilities, a common shop cause owners, of pyrexia granary of workers,unknown andorigin garbage throughout collectors) SE orAsia. exposure Occupational to mite habitat contacts in lonwithg grassrats (e.g. hikersconstru andction so ldiers)workers are inrisk make factors.-shift container facilities, shop owners, granary workers, and garbage collectors) or exposure to mite habitats in long grass (e.g. Inhikers Singapore, and soldiers) a total are ofrisk 13 factors. laboratory confirmed cases of murine typhus were r eported in 2008. The majority of cases were foreign workers. In Singapore, a total of 13 laboratory confirmed cases of murine typhus were Clinicalreported Featuresin 2008. The majority of cases were foreign workers. Fever Clinical Headache Features (prominent) MyalgiaFever ConjunctiHeadache val(prominent) suffusion MaculopapularMyalgia rash Conjunctival suffusion Scrub Maculopapular typhus may alsorash have: relative bradycardia, eschar (80%), painful regional adenopathy, hepatosplenomegaly, meningoencephalitis and renal failure. -
Mechanisms of Rickettsia Parkeri Invasion of Host Cells and Early Actin-Based Motility
Mechanisms of Rickettsia parkeri invasion of host cells and early actin-based motility By Shawna Reed A dissertation submitted in partial satisfaction of the requirements for the degree of Doctor of Philosophy in Microbiology in the Graduate Division of the University of California, Berkeley Committee in charge: Professor Matthew D. Welch, Chair Professor David G. Drubin Professor Daniel Portnoy Professor Kathleen R. Ryan Fall 2012 Mechanisms of Rickettsia parkeri invasion of host cells and early actin-based motility © 2012 By Shawna Reed ABSTRACT Mechanisms of Rickettsia parkeri invasion of host cells and early actin-based motility by Shawna Reed Doctor of Philosophy in Microbiology University of California, Berkeley Professor Matthew D. Welch, Chair Rickettsiae are obligate intracellular pathogens that are transmitted to humans by arthropod vectors and cause diseases such as spotted fever and typhus. Spotted fever group (SFG) Rickettsia hijack the host actin cytoskeleton to invade, move within, and spread between eukaryotic host cells during their obligate intracellular life cycle. Rickettsia express two bacterial proteins that can activate actin polymerization: RickA activates the host actin-nucleating Arp2/3 complex while Sca2 directly nucleates actin filaments. In this thesis, I aimed to resolve which host proteins were required for invasion and intracellular motility, and to determine how the bacterial proteins RickA and Sca2 contribute to these processes. Although rickettsiae require the host cell actin cytoskeleton for invasion, the cytoskeletal proteins that mediate this process have not been completely described. To identify the host factors important during cell invasion by Rickettsia parkeri, a member of the SFG, I performed an RNAi screen targeting 105 proteins in Drosophila melanogaster S2R+ cells. -
Gene Gain and Loss Events in Rickettsia and Orientia Species Kalliopi Georgiades1,2, Vicky Merhej1, Khalid El Karkouri1, Didier Raoult1, Pierre Pontarotti2*
Georgiades et al. Biology Direct 2011, 6:6 http://www.biology-direct.com/content/6/1/6 RESEARCH Open Access Gene gain and loss events in Rickettsia and Orientia species Kalliopi Georgiades1,2, Vicky Merhej1, Khalid El Karkouri1, Didier Raoult1, Pierre Pontarotti2* Abstract Background: Genome degradation is an ongoing process in all members of the Rickettsiales order, which makes these bacterial species an excellent model for studying reductive evolution through interspecies variation in genome size and gene content. In this study, we evaluated the degree to which gene loss shaped the content of some Rickettsiales genomes. We shed light on the role played by horizontal gene transfers in the genome evolution of Rickettsiales. Results: Our phylogenomic tree, based on whole-genome content, presented a topology distinct from that of the whole core gene concatenated phylogenetic tree, suggesting that the gene repertoires involved have different evolutionary histories. Indeed, we present evidence for 3 possible horizontal gene transfer events from various organisms to Orientia and 6 to Rickettsia spp., while we also identified 3 possible horizontal gene transfer events from Rickettsia and Orientia to other bacteria. We found 17 putative genes in Rickettsia spp. that are probably the result of de novo gene creation; 2 of these genes appear to be functional. On the basis of these results, we were able to reconstruct the gene repertoires of “proto-Rickettsiales” and “proto-Rickettsiaceae”, which correspond to the ancestors of Rickettsiales and Rickettsiaceae, respectively. Finally, we found that 2,135 genes were lost during the evolution of the Rickettsiaceae to an intracellular lifestyle. Conclusions: Our phylogenetic analysis allowed us to track the gene gain and loss events occurring in bacterial genomes during their evolution from a free-living to an intracellular lifestyle. -
Scrub Typhus and Molecular Characterization of Orientia Tsutsugamushi from Central Nepal
pathogens Article Scrub Typhus and Molecular Characterization of Orientia tsutsugamushi from Central Nepal Rajendra Gautam 1, Keshab Parajuli 1, Mythili Tadepalli 2, Stephen Graves 2, John Stenos 2,* and Jeevan Bahadur Sherchand 1 1 Department of Microbiology, Maharajgunj Medical Campus, Institute of Medicine, Kathmandu 44600, Nepal; [email protected] (R.G.); [email protected] (K.P.); [email protected] (J.B.S.) 2 Australian Rickettsial Reference Laboratory, Geelong, VIC 3220, Australia; [email protected] (M.T.); [email protected] (S.G.) * Correspondence: [email protected]; Tel.: +61-342151357 Abstract: Scrub typhus is a vector-borne, acute febrile illness caused by Orientia tsutsugamushi. Scrub typhus continues to be an important but neglected tropical disease in Nepal. Information on this pathogen in Nepal is limited to serological surveys with little information available on molecular methods to detect O. tsutsugamushi. Limited information exists on the genetic diversity of this pathogen. A total of 282 blood samples were obtained from patients with suspected scrub typhus from central Nepal and 84 (30%) were positive for O. tsutsugamushi by 16S rRNA qPCR. Positive samples were further subjected to 56 kDa and 47 kDa molecular typing and molecularly compared to other O. tsutsugamushi strains. Phylogenetic analysis revealed that Nepalese O. tsutsugamushi strains largely cluster together and cluster away from other O. tsutsugamushi strains from Asia and elsewhere. One exception was the sample of Nepal_1, with its partial 56 kDa sequence clustering Citation: Gautam, R.; Parajuli, K.; more closely with non-Nepalese O. tsutsugamushi 56 kDa sequences, potentially indicating that Tadepalli, M.; Graves, S.; Stenos, J.; homologous recombination may influence the genetic diversity of strains in this region. -
Typhus Fever, Organism Inapparently
Rickettsia Importance Rickettsia prowazekii is a prokaryotic organism that is primarily maintained in prowazekii human populations, and spreads between people via human body lice. Infected people develop an acute, mild to severe illness that is sometimes complicated by neurological Infections signs, shock, gangrene of the fingers and toes, and other serious signs. Approximately 10-30% of untreated clinical cases are fatal, with even higher mortality rates in Epidemic typhus, debilitated populations and the elderly. People who recover can continue to harbor the Typhus fever, organism inapparently. It may re-emerge years later and cause a similar, though Louse–borne typhus fever, generally milder, illness called Brill-Zinsser disease. At one time, R. prowazekii Typhus exanthematicus, regularly caused extensive outbreaks, killing thousands or even millions of people. This gave rise to the most common name for the disease, epidemic typhus. Epidemic typhus Classical typhus fever, no longer occurs in developed countries, except as a sporadic illness in people who Sylvatic typhus, have acquired it while traveling, or who have carried the organism for years without European typhus, clinical signs. In North America, R. prowazekii is also maintained in southern flying Brill–Zinsser disease, Jail fever squirrels (Glaucomys volans), resulting in sporadic zoonotic cases. However, serious outbreaks still occur in some resource-poor countries, especially where people are in close contact under conditions of poor hygiene. Epidemics have the potential to emerge anywhere social conditions disintegrate and human body lice spread unchecked. Last Updated: February 2017 Etiology Rickettsia prowazekii is a pleomorphic, obligate intracellular, Gram negative coccobacillus in the family Rickettsiaceae and order Rickettsiales of the α- Proteobacteria. -
Seroconversions for Coxiella and Rickettsial Pathogens Among US Marines Deployed to Afghanistan, 2001–2010
Seroconversions for Coxiella and Rickettsial Pathogens among US Marines Deployed to Afghanistan, 2001–2010 Christina M. Farris, Nhien Pho, Todd E. Myers, SFGR (10) highlight the inherent risk of contracting rick- Allen L. Richards ettsial-like diseases in Afghanistan. We estimated the risk for rickettsial infections in military personnel deployed to We assessed serum samples from 1,000 US Marines de- Afghanistan by measuring the rate of seroconversion for ployed to Afghanistan during 2001–2010 to find evidence SFGR, TGR, scrub typhus group Orientiae (STGO), and C. of 4 rickettsial pathogens. Analysis of predeployment and burnetii among US Marines stationed in Afghanistan dur- postdeployment samples showed that 3.4% and 0.5% of the Marines seroconverted for the causative agents of Q fever ing 2001–2010. and spotted fever group rickettsiosis, respectively. The Study Serum samples from US Marines 18–45 years of age who ickettsial and rickettsial-like diseases have played served >180 days in Afghanistan during 2001–2010 were Ra considerable role in military activities through- obtained from the US Department of Defense Serum Re- out much of recorded history (1). These diseases, which pository (DoDSR). Documentation of prior exposure to Q have worldwide distribution and cause a high number of fever or rickettsioses and sample volume <0.5 mL were deaths and illnesses, include the select agents (http://www. exclusion criteria. We selected the most recent 1,000 selectagents.gov/SelectAgentsandToxinsList.html) Rickett- postdeployment specimens that fit the inclusion criteria sia prowazekii and Coxiella burnetii, the causative agents for our study. of epidemic typhus and Q fever, respectively. -
Persistence of Orientia Tsutsugamushiin Humans
ORIGINAL ARTICLE Infectious Diseases, Microbiology & Parasitology http://dx.doi.org/10.3346/jkms.2012.27.3.231 • J Korean Med Sci 2012; 27: 231-235 Persistence of Orientia tsutsugamushi in Humans Moon-Hyun Chung1, Jin-Soo Lee1, We investigated the persistence of viable Orientia tsutsugamushi in patients who had Ji-hyeon Baek1, Mijeong Kim1, recovered from scrub typhus. Blood specimens were available from six patients with scrub and Jae-Seung Kang2 typhus who were at 1 to 18 months after the onset of the illness. The EDTA-treated blood specimens were inoculated into ECV304 cells, and cultures were maintained for 7 months. 1Departments of Internal Medicine, and 2Microbiology, Inha University School of Sequencing of the 56-kDa type-specific antigen gene ofO. tsutsugamushi was performed Medicine, Incheon, Korea to ascertain the homology of isolates. O. tsutsugamushi was isolated from all six patients, and nucleotide sequences of isolates serially collected from each patient were identical in Received: 9 October 2011 all five patients in whom nucleotide sequences were compared. One patient relapsed 2 Accepted: 3 January 2012 days after completion of antibiotic therapy; two patients complained of weakness for 1 to Address for Correspondence: 2.5 months after the illness; one patient underwent coronary angioplasty 6 months later; Jae-Seung Kang, MD and one patient suffered from a transient ischemic attack 8 months later. This finding Department of Microbiology, Inha University School of Medicine, 27 Inhang-ro, Jung-gu, Incheon 400-712, Korea suggests that O. tsutsugamushi causes chronic latent infection, which may be associated Tel: +82.32-890-0952, Fax: +82.32-881-8559 with certain clinical illnesses, preceded by scrub typhus. -
Journal of Clinical Microbiology
JOURNAL OF CLINICAL MICROBIOLOGY Volume 46 April 2008 No. 4 BACTERIOLOGY Reductions in Workload and Reporting Time by Use of Philippe R. S. Lagace´-Wiens, 1174–1177 Methicillin-Resistant Staphylococcus aureus Screening with Michelle J. Alfa, Kanchana MRSASelect Medium Compared to Mannitol-Salt Medium Manickam, and Godfrey K. M. Supplemented with Oxacillin Harding Rapid Antimicrobial Susceptibility Determination of Vesna Ivancˇic´, Mitra Mastali, Neil 1213–1219 Uropathogens in Clinical Urine Specimens by Use of ATP Percy, Jeffrey Gornbein, Jane T. Bioluminescence Babbitt, Yang Li, Elliot M. Landaw, David A. Bruckner, Bernard M. Churchill, and David A. Haake High-Resolution Genotyping of Campylobacter Species by James C. Hannis, Sheri M. Manalili, 1220–1225 Use of PCR and High-Throughput Mass Spectrometry Thomas A. Hall, Raymond Ranken, Neill White, Rangarajan Sampath, Lawrence B. Blyn, David J. Ecker, Robert E. Mandrell, Clifton K. Fagerquist, Anna H. Bates, William G. Miller, and Steven A. Hofstadler Development and Evaluation of Immunochromatographic Kentaro Kawatsu, Yuko Kumeda, 1226–1231 Assay for Simple and Rapid Detection of Campylobacter Masumi Taguchi, Wataru jejuni and Campylobacter coli in Human Stool Specimens Yamazaki-Matsune, Masashi Kanki, and Kiyoshi Inoue Evaluation of an Automated Instrument for Inoculating and J. H. Glasson, L. H. Guthrie, D. J. 1281–1284 Spreading Samples onto Agar Plates Nielsen, and F. A. Bethell New Immuno-PCR Assay for Detection of Low Wenlan Zhang, Martina 1292–1297 Concentrations of Shiga Toxin 2 and Its Variants Bielaszewska, Matthias Pulz, Karsten Becker, Alexander W. Friedrich, Helge Karch, and Thorsten Kuczius Suppression-Subtractive Hybridization as a Strategy To Laure Maigre, Christine Citti, Marc 1307–1316 Identify Taxon-Specific Sequences within the Mycoplasma Marenda, Franc¸ois Poumarat, and mycoides Cluster: Design and Validation of an M. -
Identification of Trombiculid Chigger Mites Collected on Rodents from Southern Vietnam and Molecular Detection of Rickettsiaceae Pathogen
ISSN (Print) 0023-4001 ISSN (Online) 1738-0006 Korean J Parasitol Vol. 58, No. 4: 445-450, August 2020 ▣ ORIGINAL ARTICLE https://doi.org/10.3347/kjp.2020.58.4.445 Identification of Trombiculid Chigger Mites Collected on Rodents from Southern Vietnam and Molecular Detection of Rickettsiaceae Pathogen 1, 2, 1 3 4,5, 4,5, Minh Doan Binh †, Sinh Cao Truong †, Dong Le Thanh , Loi Cao Ba , Nam Le Van * , Binh Do Nhu * 1Ho Chi Minh Institute of Malariology-Parasitology and Entomology, Ho Chi Minh Vietnam; 2Vinh Medical University, Nghe An, Vietnam; 3National Institute of Malariology-Parasitology and Entomology, Ha Noi, Vietnam; 4Military Hospital 103, Ha Noi, Vietnam; 5Vietnam Military Medical University, Ha Noi, Vietnam Abstract: Trombiculid “chigger” mites (Acari) are ectoparasites that feed blood on rodents and another animals. A cross- sectional survey was conducted in 7 ecosystems of southern Vietnam from 2015 to 2016. Chigger mites were identified with morphological characteristics and assayed by polymerase chain reaction for detection of rickettsiaceae. Overall chigger infestation among rodents was 23.38%. The chigger index among infested rodents was 19.37 and a mean abun- dance of 4.61. A total of 2,770 chigger mites were identified belonging to 6 species, 3 genera, and 1 family, and pooled into 141 pools (10-20 chiggers per pool). Two pools (1.4%) of the chiggers were positive for Orientia tsutsugamushi. Rick- etsia spp. was not detected in any pools of chiggers. Further studies are needed including a larger number and diverse hosts, and environmental factors to assess scrub typhus. Key words: Oriental tsutsugamushi, Rickettsia sp., chigger mite, ectoparasite INTRODUCTION Orientia tsutsugamushi is a gram-negative bacteria and caus- ative agent of scrub typhus, is a vector-borne zoonotic disease Trombiculid mites (Acari: Trombiculidae) are ectoparasites with the potential of causing life-threatening febrile infection that are found in grasses and herbaceous vegetation. -
A Streamlined Method for Transposon Mutagenesis of Rickettsia Parkeri
bioRxiv preprint doi: https://doi.org/10.1101/277160; this version posted March 8, 2018. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 1 A streamlined method for transposon mutagenesis of 2 Rickettsia parkeri yields numerous mutations that 3 impact infection 4 5 Rebecca L. Lamason1,#a,*, Natasha M. Kafai1,#b, and Matthew D. Welch1* 6 7 8 1 Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, 9 CA 10 #a Current address: Department of Biology, Massachusetts Institute of Technology, 11 Cambridge, MA 12 #b Current address: Medical Scientist Training Program, Washington University in St. 13 Louis School of Medicine, St. Louis, MO 14 15 16 17 18 * Co-corresponding authors 19 E-mail: [email protected], [email protected] 20 1 bioRxiv preprint doi: https://doi.org/10.1101/277160; this version posted March 8, 2018. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 21 Abstract 22 The rickettsiae are obligate intracellular alphaproteobacteria that exhibit a complex 23 infectious life cycle in both arthropod and mammalian hosts. As obligate intracellular 24 bacteria, Rickettsia are highly adapted to living inside a variety of host cells, including 25 vascular endothelial cells during mammalian infection. Although it is assumed that the 26 rickettsiae produce numerous virulence factors that usurp or disrupt various host cell 27 pathways, they have been challenging to genetically manipulate to identify the key 28 bacterial factors that contribute to infection. -
Orientia Tsutsugamushi in Conventional Hemocultures
DISPATCHES Survival and Growth of Orientia tsutsugamushi in Conventional Hemocultures Sabine Dittrich, Elizabeth Card, culture at Biosafety Level 3, which is only available at a Weerawat Phuklia, Williams E. Rudgard, limited number of specialized centers. Therefore, molecu- Joy Silousok, Phonelavanh Phoumin, lar detection of O. tsutsugamushi in patients’ EDTA-blood Latsaniphone Bouthasavong, Sarah Azarian, buffy coat has become the tool of choice for routine diag- Viengmon Davong, David A.B. Dance, nosis and epidemiologic studies (11,12). In other pathogens Manivanh Vongsouvath, with low bacterial loads, propagation of the organism be- Rattanaphone Phetsouvanh, Paul N. Newton fore molecular amplification has increased target density and improved sensitivity of diagnostic tools such as quanti- Orientia tsutsugamushi, which requires specialized facilities tative PCR (qPCR) or isolation in cell cultures (13). In line for culture, is a substantial cause of disease in Asia. We with these findings, we hypothesized thatO. tsutsugamushi demonstrate that O. tsutsugamushi numbers increased for can survive and potentially grow in conventional hemocul- up to 5 days in conventional hemocultures. Performing such a culture step before molecular testing could increase the ture media within the co-inoculated human host cells and sensitivity of O. tsutsugamushi molecular diagnosis. that this capacity for growth could be used to improve di- agnostic and analytical sensitivities. rientia tsutsugamushi, the causative agent of scrub ty- The Study Ophus, has long been a pathogen of major public health We conducted this study at the Microbiology Laboratory, concern in the Asia-Pacific region (1,2). Reports from In- Mahosot Hospital, Vientiane, Laos, the only microbiology dia, China, and Southeast Asia suggest that a substantial laboratory in Vientiane with a routine, accessible hemo- proportion of fevers and central nervous system infections culture service for sepsis diagnosis (4,14).