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• Activation of ASC Inflammasome Driven by Toll-Like Receptor 4 Contributes to Host Immunity against Rickettsial Infection

  Rumfield, C., Hyseni, I., McBride, J. W., Walker, D. H. & Fang, R., Mar 23 2020, In: Infection and immunity. 88, 4

  Research output: Contribution to journal › Article › peer-review

  • Inflammasomes
  • Toll-Like Receptor 4
  • Interleukin-1
  • Immunity
  • Macrophages

• Analysis of health-Care charges in murine typhus: Need for improved clinical recognition and diagnostics for acute disease

  Vohra, R. F., Walker, D. H. & Blanton, L. S., 2018, In: American Journal of Tropical Medicine and Hygiene. 98, 6, p. 1594-1598 5 p.

  Research output: Contribution to journal › Article › peer-review

  • Endemic Flea-Borne Typhus
  • Acute Disease
  • Delivery of Health Care
  • Human Influenza
  • Rickettsia typhi
  5 Scopus citations

• An animal model of a newly emerging human ehrlichiosis

  Saito, T. B., Thirumalapura, N. R., Shelite, T. R., Rockx-Brouwer, D., Popov, V. L. & Walker, D. H., Feb 1 2015, In: Journal of Infectious Diseases. 211, 3, p. 452-461 10 p.

  Research output: Contribution to journal › Article › peer-review

  • Ehrlichia
  • Ehrlichiosis
  • Animal Models
  • Infection
  • Clinical Chemistry
  14 Scopus citations

• An Intradermal Inoculation Mouse Model for Immunological Investigations of Acute Scrub Typhus and Persistent Infection

  Soong, L., Mendell, N. L., Olano, J. P., Rockx-Brouwer, D., Xu, G., Goez-Rivillas, Y., Drom, C., Shelite, T. R., Valbuena, G., Walker, D. H. & Bouyer, D. H., Aug 1 2016, In: PLoS neglected tropical diseases. 10, 8, e0004884.

  Research output: Contribution to journal › Article › peer-review

  • Immunological Models
  • Scrub Typhus
  • Infection
  • Orientia tsutsugamushi
  • Interleukin-9
  15 Scopus citations

• Anthrax

  Rao, G. R. & Walker, D. H., Dec 1 2011, Tropical Infectious Diseases. Elsevier Inc., p. 261-264 4 p.

  Research output: Chapter in Book/Report/Conference proceeding › Chapter

• Approaches to vaccines against Orientia tsutsugamushi

  Valbuena, G. & Walker, D. H., 2013, In: Frontiers in cellular and infection microbiology. 4, JAN, Article 170.

  Research output: Contribution to journal › Article › peer-review

  • Orientia tsutsugamushi
  • Scrub Typhus
  • Vaccines
  • Pacific Ocean
  • Northern Asia

• Approaches to vaccines against Orientia tsutsugamushi

  Valbuena, G. & Walker, D. H., 2013, In: Frontiers in Cellular and Infection Microbiology. 4, JAN, Article 170.

  Research output: Contribution to journal › Review article › peer-review

  Open Access

  • Orientia tsutsugamushi
  • Scrub Typhus
  • Vaccines
  • Pacific Ocean
  • Northern Asia
  43 Scopus citations

• A review of the global epidemiology of scrub typhus

  Xu, G., Walker, D. H., Jupiter, D., Melby, P. C. & Arcari, C. M., Nov 3 2017, In: PLoS neglected tropical diseases. 11, 11, e0006062.

  Research output: Contribution to journal › Article › peer-review

  • Scrub Typhus
  • Epidemiology
  • Orientia tsutsugamushi
  • Public Health
  • Neglected Diseases
  73 Scopus citations

• A single mutation (V64G) within the ring domain of Z attenuates junin virus

  Hallam, S. J., Manning, J. T., Maruyama, J., Seregin, A., Huang, C., Walker, D. H., de la Torre, J. C. & Paessler, S., Sep 2020, In: PLoS neglected tropical diseases. 14, 9, p. 1-15 15 p., e0008555.

  Research output: Contribution to journal › Article › peer-review

  Open Access

  • New World Arenaviruses
  • Junin virus
  • Mutation
  • Arenaviridae
  • Fever

• A Tick Vector Transmission Model of Monocytotropic Ehrlichiosis

  Saito, T. B. & Walker, D. H., Sep 15 2015, In: Journal of Infectious Diseases. 212, 6, p. 968-977 10 p.

  Research output: Contribution to journal › Article › peer-review

  • Ehrlichiosis
  • Ticks
  • Ehrlichia
  • Nymph
  • Larva
  13 Scopus citations

• Bartonelloses

  Dehio, C., Maguiña, C. & Walker, D. H., Dec 1 2011, Tropical Infectious Diseases. Elsevier Inc., p. 265-270 6 p.

  Research output: Chapter in Book/Report/Conference proceeding › Chapter

• Case-Fatality ratio and effectiveness of ribavirin therapy among hospitalized patients in china who had severe fever with thrombocytopenia syndrome

  Liu, W., Lu, Q. B., Cui, N., Li, H., Wang, L. Y., Liu, K., Yang, Z. D., Wang, B. J., Wang, H. Y., Zhang, Y. Y., Zhuang, L., Hu, C. Y., Yuan, C., Fan, X. J., Wang, Z., Zhang, L., Zhang, X. A., Walker, D. H. & Cao, W. C., Nov 1 2013, In: Clinical Infectious Diseases. 57, 9, p. 1292-1299 8 p.

  Research output: Contribution to journal › Article › peer-review

  • Ribavirin
  • Thrombocytopenia
  • China
  • Fever
  • Fatal Outcome
  96 Scopus citations

• Case report: An unusual cutaneous manifestation in a patient with murine typhus

  Blanton, L. S., Lea, A. S., Kelly, B. C. & Walker, D. H., Dec 2015, In: American Journal of Tropical Medicine and Hygiene. 93, 6, p. 1164-1167 4 p.

  Research output: Contribution to journal › Article › peer-review

  • Endemic Flea-Borne Typhus
  • Skin Manifestations
  • Rickettsia typhi
  • Siphonaptera
  • Mites
  9 Scopus citations

• CD8⁺T cells provide immune protection against murine disseminated endotheliotropic Orientia tsutsugamushi infection

  Xu, G., Mendell, N. L., Liang, Y., Shelite, T. R., Goez-Rivillas, Y., Soong, L., Bouyer, D. H. & Walker, D. H., Jul 19 2017, In: PLoS neglected tropical diseases. 11, 7, e0005763.

  Research output: Contribution to journal › Article › peer-review

  • Scrub Typhus
  • Orientia tsutsugamushi
  • T-Lymphocytes
  • Bacterial Load
  • Immunity
  15 Scopus citations

• Chlamydial, Mycoplasmal, Rickettsial, and Ehrlichial Diseases

  Walker, D. H., 2018, Pulmonary Pathology: A Volume in the Series: Foundations in Diagnostic Pathology. Elsevier Inc., p. 315-326 12 p.

  Research output: Chapter in Book/Report/Conference proceeding › Chapter

• Compartmentalized, functional role of angiogenin during spotted fever group rickettsia-induced endothelial barrier dysfunction: Evidence of possible mediation by host tRNA-derived small noncoding RNAs

  Gong, B., Lee, Y. S., Lee, I., Shelite, T. R., Kunkeaw, N., Xu, G., Lee, K., Jeon, S. H., Johnson, B. H., Chang, Q., Ha, T., Mendell, N. L., Cheng, X., Bouyer, D. H., Boor, P. J., Ksiazek, T. G. & Walker, D. H., Jun 23 2013, In: BMC Infectious Diseases. 13, 1, 285.

  Research output: Contribution to journal › Article › peer-review

  • angiogenin
  • Spotted Fever Group Rickettsiosis
  • Rickettsia
  • Small Untranslated RNA
  • Transfer RNA
  25 Scopus citations

• Diagnosing emerging and reemerging infectious diseases: The pivotal role of the pathologist

  Olano, J. P. & Walker, D. H., Jan 1 2011, In: Archives of Pathology and Laboratory Medicine. 135, 1, p. 83-91 9 p.

  Research output: Contribution to journal › Article › peer-review

  • Emerging Communicable Diseases
  • Pathologists
  • Communicable Diseases
  • Molecular Pathology
  • United States Food and Drug Administration
  15 Scopus citations

• Distinguishing Tropical Infectious Diseases from Bioterrorism

  Olano, J. P., Peters, C. J. & Walker, D. H., Dec 1 2011, Tropical Infectious Diseases. Elsevier Inc., p. 879-886 8 p.

  Research output: Chapter in Book/Report/Conference proceeding › Chapter

• Editorial: Changing dynamics of human-rickettsial interactions

  Walker, D. H., Jan 2016, In: American Journal of Tropical Medicine and Hygiene. 94, 1, p. 3-4 2 p.

  Research output: Contribution to journal › Editorial › peer-review
  5 Scopus citations

• Ehrlichia chaffeensis and E. canis hypothetical protein immunoanalysis reveals small secreted immunodominant proteins and conformation-dependent antibody epitopes

  Luo, T., Patel, J. G., Zhang, X., Walker, D. H. & McBride, J. W., Dec 1 2020, In: npj Vaccines. 5, 1, 85.

  Research output: Contribution to journal › Article › peer-review

  Open Access

  • Ehrlichia chaffeensis
  • Protein Conformation
  • Epitopes
  • Antibodies
  • Proteins

• Ehrlichioses: An important one health opportunity

  Saito, T. B. & Walker, D. H., Sep 1 2016, In: Veterinary Sciences. 3, 3, 20.

  Research output: Contribution to journal › Review article › peer-review

  • ehrlichiosis
  • Ehrlichiosis
  • Ehrlichia
  • T-Lymphocytes
  • Health
  11 Scopus citations

• Endothelial Activation and Injury: The Mechanisms of Rickettsial Vasculiti

  Sahni, A., Narra, H. P., Walker, D. H. & Sahni, S. K., Jan 1 2016, Vascular Responses to Pathogens. Elsevier Inc., p. 111-122 12 p.

  Research output: Chapter in Book/Report/Conference proceeding › Chapter

  • Wounds and Injuries
  • Infection
  • Rickettsia Infections
  • Arthropod Vectors
  • Rickettsia
  5 Scopus citations

• Endothelial cell proteomic response to Rickettsia conorii infection reveals activation of the Janus Kinase (JAK)-signal transducer and activator of transcription (STAT)-inferferon stimulated gene (ISG)15 pathway and reprogramming plasma membrane integrin/cadherin signaling

  Zhao, Y., Valbuena, G., Walker, D. H., Gazi, M., Hidalgo, M., DeSousa, R., Oteo, J. A., Goez, Y. & Brasier, A. R., Jan 2016, In: Molecular and Cellular Proteomics. 15, 1, p. 289-304 16 p.

  Research output: Contribution to journal › Article › peer-review

  • Boutonneuse Fever
  • Endothelial cells
  • Cell membranes
  • Proteomics
  • Janus Kinases
  10 Scopus citations

• Epidemiology, molecular biology, and pathogenic mechanisms of Ehrlichia infections

  Yu, X. J. & Walker, D., Jan 1 2016, Rickettsiales: Biology, Molecular Biology, Epidemiology, and Vaccine Development. Springer International Publishing, p. 225-240 16 p.

  Research output: Chapter in Book/Report/Conference proceeding › Chapter

  • Ehrlichia
  • Ehrlichiosis
  • Molecular Biology
  • Epidemiology
  • Pattern Recognition Receptors
  1 Scopus citations

• Exchange protein directly activated by cAMP plays a critical role in bacterial invasion during fatal rickettsioses

  Gong, B., Shelite, T., Mei, F. C., Ha, T., Hu, Y., Xu, G., Chang, Q., Wakamiya, M., Ksiazek, T. G., Boor, P. J., Bouyer, D. H., Popov, V. L., Chen, J., Walker, D. H. & Cheng, X., Nov 26 2013, In: Proceedings of the National Academy of Sciences of the United States of America. 110, 48, p. 19615-19620 6 p.

  Research output: Contribution to journal › Article › peer-review

  • 3-(5-tert-butylisoxazol-3-yl)-2-((3-chlorophenyl)hydrazono)-3-oxopropionitrile
  • Spotted Fever Group Rickettsiosis
  • Bioterrorism
  • Bacterial Adhesion
  • Host-Pathogen Interactions
  48 Scopus citations

• Fatal monocytic ehrlichiosis in woman, Mexico, 2013

  Sosa-Gutierrez, C. G., Solorzano-Santos, F., Walker, D. H., Torres, J., Serrano, C. A. & Gordillo-Perez, G., May 2016, In: Emerging infectious diseases. 22, 5, p. 871-874 4 p.

  Research output: Contribution to journal › Article › peer-review

  • Ehrlichiosis
  • Mexico
  • Ehrlichia chaffeensis
  • Fever
  • Tick Bites
  8 Scopus citations

• Fatal rocky mountain spotted fever in a 2-year-old child

  Walker, D. H. & Paddock, C. D., Nov 1 2011, In: Pathology Case Reviews. 16, 6, p. 238-241 4 p.

  Research output: Contribution to journal › Review article › peer-review

  • Rocky Mountain Spotted Fever
  • Spotted Fever Group Rickettsiosis
  • Brain Edema
  • Vasculitis
  • Pathologists
  1 Scopus citations

• Fever and rash after a safari

  Damavandy, A. A., Rojek, N. W., Dugan, E. M., Walker, D. & Norton, S. A., Jan 1 2015, In: Journal of the American Academy of Dermatology. 72, 1, p. e5-e6

  Research output: Contribution to journal › Article › peer-review

• Fever with thrombocytopenia associated with a novel bunyavirus in China

  Yu, X. J., Liang, M. F., Zhang, S. Y., Liu, Y., Li, J. D., Sun, Y. L., Zhang, L., Zhang, Q. F., Popov, V. L., Li, C., Qu, J., Li, Q., Zhang, Y. P., Hai, R., Wu, W., Wang, Q., Zhan, F. X., Wang, X. J., Kan, B., Wang, S. W. & 26 others, Wan, K. L., Jing, H. Q., Lu, J. X., Yin, W. W., Zhou, H., Guan, X. H., Liu, J. F., Bi, Z. Q., Liu, G. H., Ren, J., Wang, H., Zhao, Z., Song, J. D., He, J. R., Wan, T., Zhang, J. S., Fu, X. P., Sun, L. N., Dong, X. P., Feng, Z. J., Yang, W. Z., Hong, T., Zhang, Y., Walker, D. H., Wang, Y. & Li, D. X., Apr 21 2011, In: New England Journal of Medicine. 364, 16, p. 1523-1532 10 p.

  Research output: Contribution to journal › Article › peer-review

  • Orthobunyavirus
  • Thrombocytopenia
  • China
  • Fever
  • Phlebovirus
  756 Scopus citations

• Fibroblast growth factor receptor-1 mediates internalization of pathogenic spotted fever rickettsiae into host endothelium

  Sahni, A., Patel, J., Narra, H. P., Schroeder, C. L. C., Walker, D. H. & Sahni, S. K., Aug 2017, In: PloS one. 12, 8, e0183181.

  Research output: Contribution to journal › Article › peer-review

  • fibroblast growth factor receptor 1
  • Spotted Fever Group Rickettsiosis
  • Endothelial cells
  • Receptor, Fibroblast Growth Factor, Type 1
  • fibroblast growth factor receptors
  9 Scopus citations

• Flea-Borne Rickettsioses and Rickettsiae

  Blanton, L. S. & Walker, D. H., Jan 2017, In: American Journal of Tropical Medicine and Hygiene. 96, 1, p. 53-56 4 p.

  Research output: Contribution to journal › Review article › peer-review

  • Siphonaptera
  • Rickettsia felis
  • Rickettsia typhi
  • Ecology
  • Uncertainty
  32 Scopus citations

• Genotypic characterization of Orientia tsutsugamushi from patients in two geographical locations in Sri Lanka

  Premaratna, R., Blanton, L. S., Samaraweera, D. N., de Silva, G. N. N., Chandrasena, N. T. G. A., Walker, D. H. & de Silva, H. J., Jan 13 2017, In: BMC Infectious Diseases. 17, 1, 67.

  Research output: Contribution to journal › Article › peer-review

  • Orientia tsutsugamushi
  • Sri Lanka
  • Genotype
  • Real-Time Polymerase Chain Reaction
  • Fever
  7 Scopus citations

• Human monocytic ehrlichiosis, Mexico City, Mexico

  Alcántara-Rodríguez, V. E., Sánchez-Montes, S., Contreras, H., Colunga-Salas, P., Fierro-Flores, L., Avalos, S., Rodríguez-Rangel, F., Becker, I. & Walker, D. H., Dec 2020, In: Emerging infectious diseases. 26, 12, p. 3016-3019 4 p.

  Research output: Contribution to journal › Article › peer-review

  • Ehrlichiosis
  • Mexico
  • Ehrlichia canis
  • Ehrlichia
  • Infection

• Human rickettsiosis caused by rickettsia parkeri strain Atlantic rainforest, Urabá, Colombia

  Arboleda, M., Acevedo-Gutiérrez, L. Y., Ávila, A., Ospina, D., Díaz, F. J., Walker, D. H. & Rodas, J. D., Dec 2020, In: Emerging infectious diseases. 26, 12, p. 3048-3050 3 p.

  Research output: Contribution to journal › Article › peer-review

  • Rainforest
  • Rickettsia
  • Colombia
  • vpr Genes
  • Gene Amplification

• Immunization with Ehrlichia P28 outer membrane proteins confers protection in a mouse model of ehrlichiosis

  Crocquet-Valdes, P. A., Thirumalapura, N. R., Ismail, N., Yu, X., Saito, T. B., Stevenson, H. L., Pietzsch, C. A., Thomas, S. & Walker, D. H., Dec 2011, In: Clinical and Vaccine Immunology. 18, 12, p. 2018-2025 8 p.

  Research output: Contribution to journal › Article › peer-review

  • Ehrlichia
  • Immunization
  • Ehrlichiosis
  • T-cells
  • Membrane Proteins
  17 Scopus citations

• Immunohistology of Infectious Diseases

  Ezyaguirre, E. J., Walker, D. H. & Zaki, S., Jan 1 2011, Diagnostic Immunohistochemistry. Elsevier Inc., p. 58-82 25 p.

  Research output: Chapter in Book/Report/Conference proceeding › Chapter
  4 Scopus citations

• Mechanisms of immunity to rickettsia and implications for vaccine development

  Walker, D., Jan 1 2017, In: Revista Colombiana de Ciencias Pecuarias. 30, p. 262-263 2 p.

  Research output: Contribution to journal › Article › peer-review

  • Spotted Fever Group Rickettsiosis
  • Rickettsia
  • vaccine development
  • fever
  • immunity

• Mice lacking functional STAT1 are highly susceptible to lethal infection with Lassa virus

  Yun, N. E., Seregin, A. V., Walker, D. H., Popov, V. L., Walker, A. G., Smith, J. N., Miller, M., de la Torre, J. C., Smith, J. K., Borisevich, V., Fair, J. N., Wauquier, N., Grant, D. S., Bockarie, B., Bente, D. & Paessler, S., 2013, In: Journal of virology. 87, 19, p. 10908-10911 4 p.

  Research output: Contribution to journal › Article › peer-review

  • Lassa virus fever
  • Lassa virus
  • Lassa Fever
  • Arenavirus
  • Western Africa
  33 Scopus citations

• Molecular and cellular pathobiology of Ehrlichia infection: Targets for new therapeutics and immunomodulation strategies

  McBride, J. W. & Walker, D. H., Jan 2011, In: Expert reviews in molecular medicine. 13, e3.

  Research output: Contribution to journal › Article › peer-review

  • Ehrlichiosis
  • Immunomodulation
  • Ehrlichia
  • Host-Pathogen Interactions
  • Rickettsiales
  37 Scopus citations

• Murine models of scrub typhus associated with host control of Orientia tsutsugamushi infection

  Mendell, N. L., Bouyer, D. H. & Walker, D. H., Mar 10 2017, In: PLoS neglected tropical diseases. 11, 3, e0005453.

  Research output: Contribution to journal › Article › peer-review

  • Scrub Typhus
  • Orientia tsutsugamushi
  • Infection
  • Trombiculidae
  • Heterologous Immunity
  10 Scopus citations

• MyD88 mediates instructive signaling in dendritic cells and protective inflammatory response during rickettsial infection

  Bechelli, J., Smalley, C., Zhao, X., Judy, B., Valdes, P., Walker, D. H. & Fang, R., Apr 1 2016, In: Infection and immunity. 84, 4, p. 883-893 11 p.

  Research output: Contribution to journal › Article › peer-review

  • Dendritic Cells
  • Interleukin-1
  • Infection
  • Bone Marrow
  • Rickettsia
  12 Scopus citations

• Obligate intracellular bacterium Ehrlichia inhibiting mitochondrial activity

  Liu, Y., Zhang, Z., Jiang, Y., Zhang, L., Popov, V. L., Zhang, J., Walker, D. H. & Yu, X. J., Mar 2011, In: Microbes and Infection. 13, 3, p. 232-238 7 p.

  Research output: Contribution to journal › Article › peer-review

  • Ehrlichia
  • Bacteria
  • Mitochondria
  • Phagocytes
  • Ehrlichia chaffeensis
  15 Scopus citations

• Opossums and cat fleas: New insights in the ecology of murine typhus in Galveston, Texas

  Blanton, L. S., Idowu, B. M., Tatsch, T. N., Henderson, J. M., Bouyer, D. H. & Walker, D. H., Aug 2016, In: American Journal of Tropical Medicine and Hygiene. 95, 2, p. 457-461 5 p.

  Research output: Contribution to journal › Article › peer-review

  • Ctenocephalides
  • Endemic Flea-Borne Typhus
  • Siphonaptera
  • Opossums
  • Ecology
  31 Scopus citations

• Pathogenesis of the viral hemorrhagic fevers

  Paessler, S. & Walker, D. H., Jan 2013, In: Annual Review of Pathology: Mechanisms of Disease. 8, p. 411-440 30 p.

  Research output: Contribution to journal › Review article › peer-review

  • Viral Hemorrhagic Fevers
  • fever
  • pathogenesis
  • Marburg Virus Disease
  • Orthobunyavirus
  152 Scopus citations

• Permissive and protective roles for neutrophils in leishmaniasis

  Carlsen, E. D., Liang, Y., Shelite, T. R., Walker, D. H., Melby, P. C. & Soong, L., Nov 2015, In: Clinical and Experimental Immunology. 182, 2, p. 109-18 10 p.

  Research output: Contribution to journal › Article › peer-review

  • Leishmaniasis
  • Parasites
  • Neutrophils
  • Leishmania
  • Infection
  32 Scopus citations

• Perspective Piece: Ideal Criteria for Accurate Mouse Models of Vector-Borne Diseases with Emphasis on Scrub Typhus and Dengue

  Sarathy, V. V. & Walker, D. H., Sep 2020, In: American Journal of Tropical Medicine and Hygiene. 103, 3, p. 970-975 6 p.

  Research output: Contribution to journal › Review article › peer-review

  • Scrub Typhus
  • Disease Vectors
  • Dengue
  • Orientia tsutsugamushi
  • Zoonoses

• Preface

  Guerrant, R. L., Walker, D. H. & Weller, P. F., 2011, Tropical Infectious Diseases. Elsevier Inc., p. xii

  Research output: Chapter in Book/Report/Conference proceeding › Foreword/postscript

• Principles of Parasitism: Host-Parasite Interactions

  Olano, J. P., Weller, P. F., Guerrant, R. L. & Walker, D. H., 2011, Tropical Infectious Diseases. Elsevier Inc., p. 1-7 7 p.

  Research output: Chapter in Book/Report/Conference proceeding › Chapter
  1 Scopus citations

• Quantitative Proteomics of the Endothelial Secretome Identifies RC0497 as Diagnostic of Acute Rickettsial Spotted Fever Infections

  Zhao, Y., Fang, R., Zhang, J., Zhang, Y., Bechelli, J., Smalley, C., Valbuena, G., Walker, D. H., Oteo, J. A. & Brasier, A. R., Feb 2020, In: American Journal of Pathology. 190, 2, p. 306-322 17 p.

  Research output: Contribution to journal › Article › peer-review

  Open Access

  • Spotted Fever Group Rickettsiosis
  • Rickettsia conorii
  • Proteomics
  • Boutonneuse Fever
  • Infection
  3 Scopus citations

• Recent molecular insights into rickettsial pathogenesis and immunity

  Sahni, S. K., Narra, H. P., Sahni, A. & Walker, D. H., Oct 2013, In: Future Microbiology. 8, 10, p. 1265-1288 24 p.

  Research output: Contribution to journal › Review article › peer-review

  • Arthropods
  • Rickettsia prowazekii
  • Immunity
  • Rickettsia Infections
  • Epidemic Louse-Borne Typhus
  59 Scopus citations