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Merino O, De la Cruz NI, Martinez J, de León AAP, Romero-Salas D, Esteve-Gassent MD, Lagunes-Quintanilla R. Molecular detection of Rickettsia species in ticks collected in the Mexico-USA transboundary region. EXPERIMENTAL & APPLIED ACAROLOGY 2020; 80:559-567. [PMID: 32249393 DOI: 10.1007/s10493-020-00483-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2019] [Accepted: 03/20/2020] [Indexed: 06/11/2023]
Abstract
Zoonotic tick-borne diseases, including those caused by Rickettsia species, continue to have serious consequences for public health worldwide. One such disease that has emerged as a major problem in several countries of the American continent is the Rocky Mountain Spotted Fever (RMSF) caused by the bacterium Rickettsia rickettsii. Several tick species are capable of transmitting R. rickettsia, including Amblyomma cajennense, A. aureolatum, A. imitator, Rhipicephalus sanguineus, Dermacentor andersoni, D. variabilis and possibly A. americanum. Despite previous reports in Mexico linking new outbreaks of RMSF to the presence of these tick species, no robust measures have tackled transmission. In the present study, we amplified R. rickettsii from 109 test DNA samples extracted from ticks collected from several animals and humans of Tamaulipas, Mexico, between November 2015 and December 2017. Our analysis revealed the presence of R. rickettsii in six samples and these findings contribute to a spatial distribution map that is intended to minimize the risk of transmission to humans.
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Affiliation(s)
- O Merino
- Facultad de Medicina Veterinaria y Zootecnia, Universidad Autónoma de Tamaulipas, Km. 5 Carretera Victoria-Mante, CP 87000, Ciudad Victoria, TAMPS, Mexico.
| | - N I De la Cruz
- Facultad de Medicina Veterinaria y Zootecnia, Universidad Autónoma de Tamaulipas, Km. 5 Carretera Victoria-Mante, CP 87000, Ciudad Victoria, TAMPS, Mexico
| | - J Martinez
- Facultad de Medicina Veterinaria y Zootecnia, Universidad Autónoma de Tamaulipas, Km. 5 Carretera Victoria-Mante, CP 87000, Ciudad Victoria, TAMPS, Mexico
| | - A A Pérez de León
- USDA-ARS Knipling-Bushland U.S. Livestock Insects Research Laboratory and Veterinary Pest Genomics Center, Kerrville, TX, 78028, USA
| | - D Romero-Salas
- Laboratorio de Parasitología. UD PZTM. Facultad de Medicina Veterinaria y Zootecnia, Universidad Veracruzana, Veracruz, Mexico
| | - M D Esteve-Gassent
- Department of Veterinary Pathobiology, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX, 77843, USA
| | - R Lagunes-Quintanilla
- Centro Nacional de Investigación Disciplinaria en Parasitología Veterinaria, INIFAP. AP 2016, Civac, CP 62550, Jiutepec, MOR, Mexico
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COYOTES (CANIS LATRANS) IN ARIZONA, USA, EXHIBIT IMMUNE AND GENETIC EVIDENCE OF RICKETTSIAL INFECTIONS. J Wildl Dis 2020. [DOI: 10.7589/2019-01-012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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3
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Suspected and Confirmed Vector-Borne Rickettsioses of North America Associated with Human Diseases. Trop Med Infect Dis 2018; 3:tropicalmed3010002. [PMID: 30274401 PMCID: PMC6136625 DOI: 10.3390/tropicalmed3010002] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Revised: 12/18/2017] [Accepted: 12/19/2017] [Indexed: 11/27/2022] Open
Abstract
The identification of pathogenic rickettsial agents has expanded over the last two decades. In North America, the majority of human cases are caused by tick-borne rickettsioses but rickettsiae transmitted by lice, fleas, mites and other arthropods are also responsible for clinical disease. Symptoms are generally nonspecific or mimic other infectious diseases; therefore, diagnosis and treatment may be delayed. While infection with most rickettsioses is relatively mild, delayed diagnosis and treatment may lead to increased morbidity and mortality. This review will discuss the ecology, epidemiology and public health importance of suspected and confirmed vector-transmitted Rickettsia species of North America associated with human diseases.
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Silva AB, Duarte MM, Vizzoni VF, Duré AÍDL, Lopéz DM, Nogueira RDMS, Soares CAG, Machado-Ferreira E, Gazêta GS. Comparative growth of spotted fever group Rickettsia spp. strains in Vero cells. Mem Inst Oswaldo Cruz 2016; 111:528-31. [PMID: 27508322 PMCID: PMC4981112 DOI: 10.1590/0074-02760160093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Accepted: 06/21/2016] [Indexed: 11/25/2022] Open
Abstract
In Brazil, the spotted fever group (SFG) Rickettsia rickettsii and
Rickettsia parkeri related species are the etiological agents of
spotted fever rickettsiosis. However, the SFG, Rickettsia
rhipicephali, that infects humans, has never been reported. The study of
growth dynamics can be useful for understanding the infective and invasive capacity
of these pathogens. Here, the growth rates of the Brazilian isolates R.
rickettsii str. Taiaçu, R. parkeri str. At#24, and
R. rhipicephali HJ#5, were evaluated in Vero cells by
quantitative polymerase chain reaction. R. rhipicephali showed
different kinetic growth compared to R. rickettsii and R.
parkeri.
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Affiliation(s)
- Arannadia Barbosa Silva
- Fundação Oswaldo Cruz, Instituto Oswaldo Cruz, Programa de Pós-Graduação em Biodiversidade e Saúde, Rio de Janeiro, RJ, Brasil.,Fundação Oswaldo Cruz, Instituto Oswaldo Cruz, Laboratório de Referência Nacional em Vetores das Riquetsioses, Rio de Janeiro, RJ, Brasil
| | - Myrian Morato Duarte
- Fundação Ezequiel Dias, Serviço de Virologia e Riquetsioses, Belo Horizonte, MG, Brasil
| | - Vinicius Figueiredo Vizzoni
- Fundação Oswaldo Cruz, Instituto Oswaldo Cruz, Laboratório de Referência Nacional em Vetores das Riquetsioses, Rio de Janeiro, RJ, Brasil.,Universidade Federal do Rio de Janeiro, Instituto de Biologia, Laboratório de Genética Molecular de Eucariontes e Simbiontes, Rio de Janeiro, RJ, Brasil
| | - Ana Íris de Lima Duré
- Fundação Ezequiel Dias, Serviço de Virologia e Riquetsioses, Belo Horizonte, MG, Brasil
| | - Diego Montenegro Lopéz
- Fundação Oswaldo Cruz, Instituto Oswaldo Cruz, Laboratório de Referência Nacional em Vetores das Riquetsioses, Rio de Janeiro, RJ, Brasil.,Fundação Oswaldo Cruz, Instituto Oswaldo Cruz, Laboratório de Doenças Parasitárias, Rio de Janeiro, RJ, Brasil
| | - Rita de Maria Seabra Nogueira
- Universidade Estadual do Maranhão, Curso de Medicina Veterinária, Laboratório de Parasitologia, São Luís, MA, Brasil
| | - Carlos Augusto Gomes Soares
- Universidade Federal do Rio de Janeiro, Instituto de Biologia, Laboratório de Genética Molecular de Eucariontes e Simbiontes, Rio de Janeiro, RJ, Brasil
| | - Erik Machado-Ferreira
- Universidade Federal do Rio de Janeiro, Instituto de Biologia, Laboratório de Genética Molecular de Eucariontes e Simbiontes, Rio de Janeiro, RJ, Brasil
| | - Gilberto Salles Gazêta
- Fundação Oswaldo Cruz, Instituto Oswaldo Cruz, Programa de Pós-Graduação em Biodiversidade e Saúde, Rio de Janeiro, RJ, Brasil.,Fundação Oswaldo Cruz, Instituto Oswaldo Cruz, Laboratório de Referência Nacional em Vetores das Riquetsioses, Rio de Janeiro, RJ, Brasil
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5
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Sayler KA, Loftis AD, Beatty SK, Boyce CL, Garrison E, Clemons B, Cunningham M, Alleman AR, Barbet AF. Prevalence of Tick-Borne Pathogens in Host-Seeking Amblyomma americanum (Acari: Ixodidae) and Odocoileus virginianus (Artiodactyla: Cervidae) in Florida. JOURNAL OF MEDICAL ENTOMOLOGY 2016; 53:949-956. [PMID: 27117680 DOI: 10.1093/jme/tjw054] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2016] [Accepted: 03/27/2016] [Indexed: 06/05/2023]
Abstract
Amblyomma americanum (L.), the lone star tick, is an aggressive tick that is expanding its geographic range within the United States. This tick is the vector for the human and veterinary pathogens Ehrlichia chaffeensis and Ehrlichia ewingii and is associated with other microbes of unspecified pathogenicity including Rickettsia amblyommii, Panola Mountain Ehrlichia, and Borrelia lonestari In Florida, there has been sparse contemporary data on the prevalence of these organisms in host-seeking lone star ticks. To determine the prevalence of this tick and associated microbes in North Central Florida state parks, ∼1,500 lone star tick specimens were collected between 2010 and 2012 analyzed by polymerase chain reaction (PCR) sequencing. Additionally, 393 white-tailed deer, Odocoileus virginianus (Zimmerman), samples were analyzed for pathogen prevalence using molecular methods and serology. In lone star ticks, 14.6, 15.6, and 57.1% were positive for E. chaffeensis, E. ewingii, and Rickettsia spp. DNA, respectively. Panola Mountain Ehrlichia or B. lonestari DNA were each detected in nearly 2% of tick specimens. In white-tailed deer, 7.3% were PCR positive for E. chaffeensis, 6.0% for E. ewingii, and 3.2% for rickettsial species. Approximately 45% of white-tailed deer specimens had antibodies to Ehrlichia spp., and <1% had antibodies to Borrelia burgdorferi In summary, E. chaffeensis, E. ewingii, and spotted fever group rickettsia are highly prevalent in host-seeking lone star ticks and in white-tailed deer in Florida. The molecular and serological evidence of these microbes underscore their zoonotic potential in this region.
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Affiliation(s)
- Katherine A Sayler
- Department of Physiological Sciences, University of Florida College of Veterinary Medicine, 2015 SW 16th Ave., Gainesville, FL 32608 (; ; ; ),
- Department of Infectious Disease and Pathology, University of Florida College of Veterinary Medicine, 2015 SW 16th Ave., Gainesville, FL 32608
| | - Amanda D Loftis
- Department of Microbiology, Midwestern University Glendale, 19555 N 59th Ave., Glendale, AZ 85308 , and
| | - Sarah K Beatty
- Department of Physiological Sciences, University of Florida College of Veterinary Medicine, 2015 SW 16th Ave., Gainesville, FL 32608 (; ; ; )
| | - Carisa L Boyce
- Department of Physiological Sciences, University of Florida College of Veterinary Medicine, 2015 SW 16th Ave., Gainesville, FL 32608 (; ; ; )
| | - Elina Garrison
- Florida Fish and Wildlife Conservation Commission, Fish & Wildlife Research Institute, 1105 SW Williston Rd., Gainesville, FL 32601 (; ; )
| | - Bambi Clemons
- Florida Fish and Wildlife Conservation Commission, Fish & Wildlife Research Institute, 1105 SW Williston Rd., Gainesville, FL 32601 (; ; )
| | - Mark Cunningham
- Florida Fish and Wildlife Conservation Commission, Fish & Wildlife Research Institute, 1105 SW Williston Rd., Gainesville, FL 32601 (; ; )
| | - Arthur R Alleman
- Department of Physiological Sciences, University of Florida College of Veterinary Medicine, 2015 SW 16th Ave., Gainesville, FL 32608 (; ; ; )
| | - Anthony F Barbet
- Department of Infectious Disease and Pathology, University of Florida College of Veterinary Medicine, 2015 SW 16th Ave., Gainesville, FL 32608
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Blanton LS, Mendell NL, Walker DH, Bouyer DH. "Rickettsia amblyommii" induces cross protection against lethal Rocky Mountain spotted fever in a guinea pig model. Vector Borne Zoonotic Dis 2015; 14:557-62. [PMID: 25072985 DOI: 10.1089/vbz.2014.1575] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Rocky Mountain spotted fever (RMSF) is a severe illness caused by Rickettsia rickettsii for which there is no available vaccine. We hypothesize that exposure to the highly prevalent, relatively nonpathogenic "Rickettsia amblyommii" protects against R. rickettsii challenge. To test this hypothesis, guinea pigs were inoculated with "R. amblyommii." After inoculation, the animals showed no signs of illness. When later challenged with lethal doses of R. rickettsii, those previously exposed to "R. amblyommii" remained well, whereas unimmunized controls developed severe illness and died. We conclude that "R. amblyommii" induces an immune response that protects from illness and death in the guinea pig model of RMSF. These results provide a basis for exploring the use of low-virulence rickettsiae as a platform to develop live attenuated vaccine candidates to prevent severe rickettsioses.
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Affiliation(s)
- Lucas S Blanton
- 1 Department of Internal Medicine-Infectious Diseases, The University of Texas Medical Branch , Galveston, Texas
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Gong W, Wang P, Xiong X, Jiao J, Yang X, Wen B. Enhanced protection against Rickettsia rickettsii infection in C3H/HeN mice by immunization with a combination of a recombinant adhesin rAdr2 and a protein fragment rOmpB-4 derived from outer membrane protein B. Vaccine 2015; 33:985-92. [PMID: 25597943 DOI: 10.1016/j.vaccine.2015.01.017] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2014] [Revised: 01/05/2015] [Accepted: 01/06/2015] [Indexed: 11/30/2022]
Abstract
BACKGROUND Two surface proteins of Rickettsia rickettsii, outer membrane protein B (OmpB) and adhesion 2 (Adr2), have been recognized as protective antigens. Herein, the immunization with both OmpB and Adr2 was performed in mice so as to explore whether their combination could induce an enhanced immunoprotection against R. rickettsii infection. METHODS C3H/HeN mice were immunized with recombinant protein rAdr2 or/and rOmp-4, a fragment derived from OmpB, and then mice were challenged with R. rickettsii. After which rickettsial loads in mice were measured by quantitative PCR. The specific antibodies in mouse sera were determined by ELISA and antigen-specific cytokines secretion by mouse T cells were analyzed in vitro. RESULTS After challenge with R. rickettsii, the mice immunized with rAdr2 or/and rOmpB-4 had significant lower rickettsial load in livers, spleens, or lungs compared to PBS mock-immunized mice. Particularly, the load in lungs of mice immunized with both rAdr2 and rOmpB-4 was significantly lower than that with either of them. High levels of specific antibodies were detected in sera from mice immunized with rAdr2 or/and rOmpB-4, but the ratios of specific IgG2a to IgG1 induced by their combination were significantly higher than that by either rAdr2 or rOmpB-4. Following stimulation with rAdr2 or/and rOmpB-4, the INF-γ secreted by CD4(+) T cells from infected mice was significantly higher than that by cognate cells from uninfected mice. And the TNF-α secreted by CD4(+) or CD8(+) T cells from infected mice was markedly greater than that by cognate cells from uninfected mice after stimulation by their combination but not either of them. CONCLUSION The combination of rAdr2 and rOmpB-4 conferred an enhanced protection against R. rickettsii infection in mice, which was mainly dependent on a stronger Th1-oriented immunoresponse with greater INF-γ and TNF-α secretion by antigen-specific T cells and specific IgG2a elicited by the combination.
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Affiliation(s)
- Wenping Gong
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, 20 Dong-Da-Jie Street, Fengtai, Beijing 100071, China
| | - Pengcheng Wang
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, 20 Dong-Da-Jie Street, Fengtai, Beijing 100071, China; Department of Clinical Laboratory, The 105th Hospital of PLA, Hefei, Anhui 230031, China
| | - Xiaolu Xiong
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, 20 Dong-Da-Jie Street, Fengtai, Beijing 100071, China.
| | - Jun Jiao
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, 20 Dong-Da-Jie Street, Fengtai, Beijing 100071, China
| | - Xiaomei Yang
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, 20 Dong-Da-Jie Street, Fengtai, Beijing 100071, China
| | - Bohai Wen
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, 20 Dong-Da-Jie Street, Fengtai, Beijing 100071, China.
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Levin ML, Zemtsova GE, Montgomery M, Killmaster LF. Effects of homologous and heterologous immunization on the reservoir competence of domestic dogs for Rickettsia conorii (israelensis). Ticks Tick Borne Dis 2014; 5:33-40. [PMID: 24201056 PMCID: PMC5659121 DOI: 10.1016/j.ttbdis.2013.07.010] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2013] [Revised: 06/24/2013] [Accepted: 07/03/2013] [Indexed: 11/28/2022]
Abstract
A number of spotted fever group (SFG) rickettsiae cause serious infections in humans. Several antigenically related rickettsial agents may coexist within the same geographical area, and humans or vertebrate hosts may be sequentially exposed to multiple SFG agents. We assessed whether exposure of a vertebrate reservoir to one SFG Rickettsia will affect the host's immune response to a related pathogen and the efficiency of transmission to uninfected ticks. Two pairs of dogs were each infected with either Rickettsia massiliae or Rickettsia conorii israelensis, and their immune response was monitored twice weekly by IFA. The four immunized dogs and a pair of naïve dogs were each challenged with R. conorii israelensis-infected Rhipicephalus sanguineus nymphs. Uninfected Rh. sanguineus larvae were acquisition-fed on the dogs on days 1, 7, and 14 post-challenge. These ticks were tested for the presence of rickettsial DNA after molting to the nymphal stage. The naive dogs became infected with R. conorii israelensis and were infectious to ticks for at least 3 weeks, whereas reservoir competence of dogs previously infected with either R. massiliae or R. conorii was significantly diminished. This opens an opportunity for decreasing the efficiency of transmission and propagation of pathogenic Rickettsia in natural foci by immunizing the primary hosts with closely related nonpathogenic SFG bacteria. However, neither homologous immunization nor cross-immunization significantly affected the efficiency of R. conorii transmission between cofeeding infected nymphs and uninfected larvae. At high densities of ticks, the efficiency of cofeeding transmission may be sufficient for yearly amplification and persistent circulation of a rickettsial pathogen in the vector population.
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Affiliation(s)
- M L Levin
- Rickettsial Zoonoses Branch, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA.
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Diniz PPV, Beall MJ, Omark K, Chandrashekar R, Daniluk DA, Cyr KE, Koterski JF, Robbins RG, Lalo PG, Hegarty BC, Breitschwerdt EB. High Prevalence of Tick-Borne Pathogens in Dogs from an Indian Reservation in Northeastern Arizona. Vector Borne Zoonotic Dis 2010; 10:117-23. [DOI: 10.1089/vbz.2008.0184] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Pedro Paulo V.P. Diniz
- Intracellular Pathogens Research Laboratory, Center for Comparative Medicine and Translational Research, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina
| | | | | | | | | | | | - James F. Koterski
- United States Army Medical Research Institute for Infectious Diseases (USAMRIID), Fort Detrick, Maryland
| | - Richard G. Robbins
- Defense Pest Management Information Analysis Center (DPMIAC)/Armed Forces Pest Management Board (AFPMB), Walter Reed Army Medical Center, Washington, District of Columbia
| | | | - Barbara C. Hegarty
- Intracellular Pathogens Research Laboratory, Center for Comparative Medicine and Translational Research, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina
| | - Edward B. Breitschwerdt
- Intracellular Pathogens Research Laboratory, Center for Comparative Medicine and Translational Research, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina
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Demma LJ, Traeger M, Blau D, Gordon R, Johnson B, Dickson J, Ethelbah R, Piontkowski S, Levy C, Nicholson WL, Duncan C, Heath K, Cheek J, Swerdlow DL, McQuiston JH. Serologic evidence for exposure to Rickettsia rickettsii in eastern Arizona and recent emergence of Rocky Mountain spotted fever in this region. Vector Borne Zoonotic Dis 2007; 6:423-9. [PMID: 17187578 DOI: 10.1089/vbz.2006.6.423] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
During 2002 through 2004, 15 patients with Rocky Mountain spotted fever (RMSF) were identified in a rural community in Arizona where the disease had not been previously reported. The outbreak was associated with Rickettsia rickettsii in an unexpected tick vector, the brown dog tick (Rhipicephalus sanguineus), which had not been previously associated with RMSF transmission in the United States. We investigated the extent of exposure to R. rickettsii in the local area through serologic evaluations of children and dogs in 2003-2004, and in canine sera from 1996. Antibodies to R. rickettsii at titers > or = 32 were detected in 10% of children and 70% of dogs in the outbreak community and 16% of children and 57% of dogs in a neighboring community. In comparison, only 5% of canine samples from 1996 had anti-R. rickettsii antibodies at titers > or = 32. These results suggest that exposures to RMSF have increased over the past 9 years, and that RMSF may now be endemic in this region.
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Affiliation(s)
- Linda J Demma
- Centers for Disease Control and Prevention, National Center for Infectious Diseases, Division of Viral and Rickettsial Diseases, Atlanta, Georgia, USA.
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11
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Hechemy KE. Chapter 18 The rickettsiae. Microbiology (Reading) 1998. [DOI: 10.1016/s1569-2582(97)80155-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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12
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Sumner JW, Sims KG, Jones DC, Anderson BE. Protection of guinea-pigs from experimental Rocky Mountain spotted fever by immunization with baculovirus-expressed Rickettsia rickettsii rOmpA protein. Vaccine 1995; 13:29-35. [PMID: 7762273 DOI: 10.1016/0264-410x(95)80007-z] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Baculovirus recombinants that express the Rickettsia rickettsii rOmpA protein were constructed. Monoclonal antibodies (mAbs) against the rOmpA protein reacted with recombinant-infected Spodoptera frugiperda (Sf9) cells in indirect immunofluorescence assays. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis and immunoblotting of infected Sf9 cell lysates with a mAb against rOmpA showed that the recombinant-expressed rOmpA protein migrated slightly below rOmpA extracted from R. rickettsii. Guinea-pigs immunized with lysates of recombinant-infected Sf9 cells developed antibodies reactive with R. rickettsii and were protected against challenge, indicating that the baculovirus-expressed rOmpA protein could be useful in subunit vaccines and for studies of the immune response to R. rickettsii infection.
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Affiliation(s)
- J W Sumner
- Rickettsial Zoonoses Branch, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA
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