<i>Rickettsia parkeri</i>Infection after Tick Bite, Virginia

Whitman, Timothy J.; Richards, Allen L.; Paddock, Christopher D.; Tamminga, Cindy; Sniezek, Patrick J.; Jiang, Ju; Byers, David K.; Sanders, John W.

doi:10.3201/eid1302.061295

Cited by 100 publications

(77 citation statements)

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“…The three clinical cases of rickettsiosis reported in the present study presented clinical manifestations similar to previous reported cases due to R. parkeri in the United States; that is mild fever (<40 o C), malaise, headache, rash, inoculation eschar at the tick bite site, regional lymphadenopathy, and no lethality 12,18 . The three cases also presented similar pattern in the serological reactivities to different rickettsial antigens, characterized by higher and similar titers to R. parkeri and R. rickettsii, and substantially lower titers to other rickettsial antigens, including the spotted fever group agents R. felis, R. amblyommii, and R. rhipicephali.…”

Section: Discussionsupporting

confidence: 85%

Serological evidence of Rickettsia parkeri as the etiological agent of rickettsiosis in Uruguay

Conti‐Díaz¹,

Moraes‐Filho

Pacheco

et al. 2009

Rev. Inst. Med. trop. S. Paulo

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SUMMARYWe report three new rickettsiosis human cases in Uruguay. The three clinical cases presented clinical manifestations similar to previous reported cases of Rickettsia parkeri in the United States; that is mild fever (< 40 o C), malaise, headache, rash, inoculation eschar at the tick bite site, regional lymphadenopathy, and no lethality. Serological antibody-absorption tests with purified antigens of R. parkeri and Rickettsia rickettsii, associated with immunofluorescence assay indicated that the patients in two cases were infected by R. parkeri. Epidemiological and clinical evidences, coupled with our serological analysis, suggest that R. parkeri is the etiological agent of human cases of spotted fever in Uruguay, a disease that has been recognized in that country as cutaneous-ganglionar rickettsiosis.

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Section: Discussionsupporting

confidence: 85%

Serological evidence of Rickettsia parkeri as the etiological agent of rickettsiosis in Uruguay

Conti‐Díaz¹,

Moraes‐Filho

Pacheco

et al. 2009

Rev. Inst. Med. trop. S. Paulo

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“…Other pathogenic rickettsiae exist in nature and may cause human illness. For example, R. parkeri was identified as a human pathogen in 2004 [31][32][33] and was detected in an A. americanum from Knox County, Tennessee in 2007. 34 It is possible that the current human surveillance system overreports RMSF cases based on antibodies, which cross-react against other SFGR, including R. parkeri and R. amblyommii .…”

Section: Discussionmentioning

confidence: 99%

Absence of Rickettsia rickettsii and Occurrence of Other Spotted Fever Group Rickettsiae in Ticks from Tennessee

Moncayo¹,

Cohen²,

Fritzen³

et al. 2010

The American Society of Tropical Medicine and Hygiene

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Rocky Mountain spotted fever (RMSF) is the most common tick-borne illness in Tennessee. Little is known about the occurrence of R. rickettsii, the causative agent, in ticks in Tennessee. To better understand the prevalence and distribution of rickettsial agents in ticks, we tested 1,265 Amblyomma, Dermacentor, and Ixodes adult and nymphal ticks. Additionally, we tested 231 Amblyomma americanum larvae. Ticks were collected from 49 counties from humans, wild animals, domestic canines, and flannel drags. Spotted fever group rickettsiae (SFGR) DNA was detected by polymerase chain reaction (PCR) in 32% of adult and nymphal ticks. A total minimum infection rate of 85.63 was found in larval pools tested. Three rickettsial species, Rickettsia montana, Rickettsia amblyommii, and Rickettsia cooleyi were identified by molecular analysis. Rickettsia rickettsii was not detected. This study suggests that some RMSF cases reported in Tennessee may be caused by cross-reactivity with other SFGR antigenically related to R. rickettsii.

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“…Rickettsia parkeri agent is responsible for spotted fever cases in humans in the United States where it is transmitted by Amblyomma maculatum Koch, 1844(PADDOCK et al, 2004, 2008WHITMAN et al, 2007;FORNADEL et al, 2011). This pathogen was also detected in A. maculatum in Peru (FLORES-MANDONZA et al, 2013), A. triste in Uruguay (VENZAL et al, 2004a(VENZAL et al, , 2012PACHECO et al, 2006;CONTI-DÍAZ et al, 2009), Argentina (NAVA et al, 2008a and Brazil (SILVEIRA et al, 2007) andin A. tigrinum in Bolivia (TOMASSONE et al, 2010b).…”

Section: Rickettsia Parkeri and Rickettsia Parkeri-like Strainsmentioning

confidence: 99%

Ticks (Acari: Ixodidae) as ectoparasites of Brazilian wild birds and their association with rickettsial diseases

Ogrzewalska

Pintér²

2016

Braz. J. Vet. Res. Anim. Sci.

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Ticks (Acari: Ixodidae) are obligatory hematophagous ectoparasites of a variety of vertebrate hosts and play an important role in the transmission and ecology of infectious pathogens causing diseases in humans and animals worldwide. Sixty-eight species of ticks exist in Brazil, and at least 23 are found parasitizing wild birds. This number is increasing with the advent of new studies highlighting the underestimated role of birds in the life cycle of these arthropods. In South America, many of these ticks are involved in epidemiology of the life-threatening spotted fever diseases caused by bacteria from the genus Rickettsia (Rickettsiales: Rickettsiaceae). The aim of this paper is to present up-to-date knowledge about the bird-tick fauna of Brazil and their association with rickettsioses. The available literature concerning ticks on birds and tick-borne diseases related to these ticks in Brazil has been revised. It could be concluded that birds play a primary role in life cycles of various tick species, especially during immature stages (larvae and nymphs). The best known is a bird-tick fauna from the Atlantic Forest and from Brazilian savannah called Cerrado in southern and central Brazil, respectively. On the other hand, the knowledge about bird tick parasitism from other Brazilian biomes such as the Amazon, Caatinga, Pantanal and Pampas regions is very scarce and requires further study. Moreover, no studies about the role of birds as mobile hosts for spreading ticks to new areas exist, nor has their role in the natural life cycle of Rickettsia been thoroughly examined.Keywords: Ticks. Ectoparasites. Rickettsia. Disease. Birds. Brazil. ResumoOs carrapatos (Acari: Ixodoidea) são ectoparasitas obrigatórias de uma variedade de hospedeiros vertebrados e têm um papel importante na ecologia e transmissão de diversos patógenos causadores de doenças em humanos e animais no mundo todo. No Brasil existem 68 espécies de carrapatos e pelo menos 23 espécies são encontradas parasitando aves silvestres. Esse número tem crescido com o advento de novos estudos ressaltando o papel das aves nos ciclos de vida desses artrópodes. Na América do Sul alguns desses carrapatos estão envolvidos na epidemiologia de doenças graves para o ser humano, como a febre maculosa, causada por bactérias do gênero Rickettsia (Rickettsiales: Rickettsiaceae). O alvo desse artigo é apresentar o estado atual de conhecimento sobre a fauna de carrapatos encontrados em aves no Brasil e as associações estabelecidas com as riquetsioses. A literatura disponível sobre carrapatos em aves e ocorrência de riquétsias foi revisada e pôde ser concluído que aves têm um papel importante nos ciclos de vida de várias espécies de carrapatos, sendo especialmente importantes para os estágios imaturos (larvas e ninfas). A maior parte do conhecimento sabrecai na fauna de carrapatos de aves dos biomas Mata Atlântica e Cerrado no sudeste e centro-oeste do Brasil. Já o conhecimento sobre o parasitismo por carrapatos em aves dos outros biomas: Amazônia, Caatinga, Pantanal...

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Rickettsia parkeriInfection after Tick Bite, Virginia

Abstract: We describe a man with a febrile illness and an eschar that developed at the site of a tick bite. Rickettsia parkeri was detected and isolated from the eschar. This report represents the second documented case of R. parkeri rickettsiosis in a US serviceman in eastern Virginia.

Cited by 100 publications

References 10 publications

Serological evidence of Rickettsia parkeri as the etiological agent of rickettsiosis in Uruguay

Serological evidence of Rickettsia parkeri as the etiological agent of rickettsiosis in Uruguay

Absence of Rickettsia rickettsii and Occurrence of Other Spotted Fever Group Rickettsiae in Ticks from Tennessee

Ticks (Acari: Ixodidae) as ectoparasites of Brazilian wild birds and their association with rickettsial diseases

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